Openings, what is the best to play?

So I'm learning openings and tryna dive deep in theory in some openings, and I came across different moves and their evaluations. Should I  put the move that isn't the best but after playing it the consequences for my opponent for not finding the best move results in a slight increase in my advantage into my repertoire or just play the best move? 

I'm mostly learning openings that players around my level might play/ preparing for a tournament in February and possibly going for the sidelines. 

The chances that I will have a game in which I play what I memorized is low but I like making repertoires and such. 

So… if I read this right, you’re asking if you should play “objectively correct” chess or a more trappy, unsound style?

I would definitely go with the more objective style. What types of openings do you like playing and what do you currently play?

Currently I'm mostly looking to counter caro-kann defense and going for the prins attack in the advance variation, and already know some mainlines in the advance, exchanged, or non-exchanged variations but I discovered the prins and learning some openings in it as a tricky opening. 
However, I bring this up because there was a variation in the Sicilian Dragon defense rauzer variation where my opponent's best move is one that at my level will be unlikely to be played but other moves where they play can lead to a slight increase in my advantage.

In short it's where my opponent's best move is one that is hard to spot/ a strange move that people at my level who hasn't study this opening will not know how to respond and respond with a 2nd best or another move.

I have already went into some theory in the prins attack up to 8-10 moves deep and with like 4-6+ different ways black and respond. This will be one of the openings I will play in my february school tournament as a surprise opening.

The Prins Advance Caro-Kann, now that's something you don't see very often. Very interesting. It seems like an solid enough surprise weapon, with some fun plans and ideas, but you might have a bit of trouble in it, considering the best way to play against it is to play ultra-passive and merely trade down everything on the queenside, and Caro-Kann players are notorious for being most comfortable in cramped, passive positions where they wait out any threats and then trade down to an even/slightly better middlegame or endgame.
As for playing against the Dragon, you really don't need to take any risks, like ever. At your level, you can pretty much play solid moves and be better, so there's no point in playing a move that allows Black to bring the game closer to equality with best play but widens White's advantage with inaccurate play. Personally, I also always preferred the 9. Bc4 line to 9. 0-0-0, as you completely disallow Black's best prospect in the position (that being the d5 pawn break leading to a massive loss of mating material for both sides and larger drawing chances for Black). Ironically though, the 9. Bc4 line actually has a similar situation to the Rauzer, in that after 9... Bd7 10. 0-0-0 Rc8 11. Bb3 Ne5 12. Kb1 Re8 13. h4 h5 14. g4 hxg4 15. h5 Nxh5 16. Bh6 Black's best move, far and away, is 16... Kh7, but almost everybody plays 16... e6 in the database, which is just a massive mistake, allowing White the time to coordinate an even larger attack. I would highly recommend the 9. Bc4 line, by the way.

indeed. Playing the objectively best moves is always the ideal, but most times it's best to play pragmatically.

Danish Gambit for White, Rousseau Gambit for Black

I'll check through the main line Bc4 line as from what you described seems to also might be an interesting line, and I also will check through the Panov attack. 
And as a guy who has played the caro-kann a few times, yeah as black I will be able to win the endgame or force a chance at winning in the endgame than the middlegame. However, I also think that players at my level are still the type that prefer an attack in the middle game and will probably not want to be passive for long usually leading to them instigating an attack already 10+ moves in with the exceptions of players that put in quite the time to utilize the caro-kann fully at my elo. Another thing is that if black decides to trade down then I will gladly fight in the endgame as I like the endgame. Not a good comparison but against my friend who likes playing caro-kann, although he's half my elo, he's among the better players in the tournament but not by much.

(maybe like the 20-30th best? not sure as I only know that the best is a 1500 and I remember stating that I was 800 elo and was ranked 5th seed in 1 of the 4 brackets, each bracket was 16 players resulting in 16 seeds in each bracket)

I'm mostly using him as a bases for players I am to expect. 
Although his elo is half mine, he knows main line moves up to 6-8 moves in depending on the variation. While in endgame aspects, I will be able to convert into a winning advantage even in an equal position against him.
So at the same time, I'm also looking for moves that aren't gambits/ 1 shot at winning moves/ gambits but rather a sideline variation that most players won't expect. So if you know any other variations in popular openings, I'd like to hear them out and see, french defense, e4 e5, any from white or black's perspective.

danish gambit doesn't seem like one that I myself will play, but the rousseau I have played before and taught to some of my friends to play as black but not in-depth

If you're trying to win, play the Halloween gambit. If you want to lose, play the drunken king.

@1

"just play the best move?" ++ Yes.

"preparing for a tournament in February" ++ Analyse your lost games. 

"The chances that I will have a game in which I play what I memorized is low" ++ Right.

"I like making repertoires" ++ Fair enough, but that will not help you in February.

@3

"there was a variation in the Sicilian Dragon defense rauzer variation" ++ It will not happen.

@4

"the prins attack up to 8-10 moves deep" ++ It will not happen.

Oh absolutely. If you’re seeded that highly, you should have no problems winning a Prins middlegame, especially when catching players by surprise. 
It seems like you’re actually a much more positional player than your opponents are, which means I should have openings that are right up your alley, as I’m a rather positional player myself. I do have some questions first about general repertoire choices.
As White: you play e4, right? Do you play the Italian or the Ruy Lopez? Do you play the Open Sicilian against all 3 Sicilians (those being 2… Nc6, 2… e6, and 2… d6)? What’s your current choice for the French: 3. Nc3, 3. e5, 3. exd5, or 3. Nd2? 
As Black: What do you currently play against e4, d4, and c4 respectively?

I stumbled onto the mieses gambit in the carokann BY ACCIDENT and have a lot of crushing fried liver attacks in it just doing what comes natural and punishing carokanns for trying to pin my knight. I confused the maroczy fantasy variation with the alapin diemer french (the ONLY line i've gotten to within 3% of equal stats with) and saw i was destroying caros with it and switched before even knowing the gambits name.

If you're an attacker and want to deny caros their annoying pawn chains, test drive it. The only theory I've bothered to learn is to play Nc3 against ...Nf6 to encourage black to take on f3 or allow you juicy pawns on both d4 and e4.

I've played this EXACT ending three times! ...Nf6 & ...Bg4 transpose.

I had one of my best games EVER a couple days ago against an 1870 who played an early ...e6. he kept trying to close his castle with pawns until i sacked a bishop on h6 to start ripping him open and remove defenders with ALL of my forces on the kingside. Then, I played a QS knight advance he threw a pawn at when i was heading to an annoying d6 outpost to try and force a trade for his bishop he should have taken as to ended up forking the queen after i traded my second rook for black's to remove the defender and allow Nf7+

I love the mieses, even declined as it usually allows Bc4 which is as important as Nf3 the way I play, and it's good for limiting pawn play which I hate more than anything.

I'm eager to test drive double danish/2× goering and rousseu too, but 1/3 of those, almost as common as the Rousseau, require the less promising theoretical black hole luccini gambit and reversed falkbeer gambit is annoying too. If you play that, jaenish/schliemann against the Spanish is very aggressive too with its thematic ...f5 push. Just DONT play the latvian!

If you want to play a bit more "soundly", 2 Knights and fritz are aggressive too

As White I have played E4 and D4 equally amount and usually I play into the ruy lopez with some Italian (main is ruy lopez), and with D4 usually queens gambit or sometimes if possible the catalan/ fiancheto my bishop. 
As Black, against e4 I have played french, caro, sicilian (usually najdorf but a few dragon style), and e5.
While against d4 I have played Indian (kings indian, nimzo indian, queen's indian), d5 (queens gambit declines, albin countergambit) and a few dutch. 
Against Sicilian, I play open sicilian and for french defense, I usually go for exchange variation.

And yeah overall I'm more positional and don't prefer a huge fight for the middlegame unless either 1) I'm the one with the huge attack or the advantage or 2) trying to counterattack.

Fantastic, we actually have similar repertoires and I don’t really see any openings that give the opponent an undue advantage besides the Albin Countergambit.

As White with 1. e4:
Sicilian with 2… d6: I’d recommend the Open, going for the English-style setup against everything for simplicity. 
Sicilian with 2… e6: I’d recommend the KIA if you don’t want to worry about the French either, or the 4. Nc3 Kramnik if you want to learn something different against the French. 
Sicilian with 2… Nc6: Rossolimo. 
Caro-Kann: Continue with your Prins for this upcoming tournament, but if that starts failing I’d recommend swapping to the Exchange or the Breyer. 
French: KIA if that’s going to be your e6 Sicilian choice or Advance if not. 
Philidor: Qxd4, pin the knights, develop yours to good squares, castle long, and Rhe1 and you should honestly be fine. 
Petrov: 3. Nxe5, just play from intuition from there. 
Ruy Lopez, Berlin: 4. 0-0 and accept the Berlin Endgame. 
Ruy Lopez, Old Steinitz: 5. Qxd4 and transpose to your Philidor prep. 
Ruy Lopez, Morphy: Four options here: Anderssen Duras with 5. d3 g6 6. c4 Bg7 7. 0-0 0-0, Martinez with 5. 0-0 Be7 6. d3 b5 7. Bb3 0-0, Anti-Marshall with 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. a4, or Pilnik with 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. d3 d6 9. c3 Na5 10. Bc2 c5. 
Ask me about what to do against the more uncommon defenses if you expect to face any in particular.

As Black against 1. e4: I’d probably recommend simply sticking with the Najdorf and learning it as best you can.
2… Nf6 against the Alapin. 
Dragon setup against the Closed. 
Ask me about the Prins and Chekhover if you expect to face them.

As Black against 1. d4: I’d recommend either learning the Slav (I’ll link a video if you’re interested in it) or continuing with the NID/QID.

As Black against 1. c4 and 1. Nf3: I’d recommend 1… b6 should you choose to continue with the NID/QID, or 1… c6 should you choose to learn the Slav.

Ask me about anything else you expect to face.