Modern or Pirc

which one is better to use for chess openings?

Personally I use Pirc and that can work well but I rarely use the modern so I don't know how they compare

i like the modern better because I feel as if the Knight in the Pirc becomes a target

The Modern is more flexible and contains many different plans according to which systems you play, while the Pirc is more fixed with the same plans and intentions. The Pirc I would say is also a bit harder to play because of the Austrian Attack which almost refutes it.

I wouldnt say it refutes it but it is challenging to play against if you don't know the c5 lines. although you can play the Austrian attack against the Modern too tbh

Well the Austrian doesn't refute it but if something will refute the Pirc in the future, it will be the Austrian. And also against the Modern it isn't that dangerous since you have not committed to castling yet.

Also I think playing the Austrian against the Modern is called the Three Pawns Attack

you havent committed to castling after nf3 either.

https://www.youtube.com/watch?v=EJmjt9GGhA8

Yasser goes into some really amazing ideas in the Austrian attack for black after c5, really cool stuff check it out

Interesting though I don't play the Pirc

The modern is more flexible as sometimes Ng8 is better at h6, but usually it is better at f6 anyway.

The Austrian Attack is pretty harmless against the Pirc. With a timely ...c5 black demonstrates that the white center d4-e4-f4 is overextended.

Famous example:

https://www.chessgames.com/perl/chessgame?gid=1044731

The Modern Defence can be shaky too. Famous example:

https://www.chessgames.com/perl/chessgame?gid=1011478

A positional approach is dangerous for black. Famous example:

https://www.chessgames.com/perl/chessgame?gid=1068052 

Depends on whether white plays c3 or c4/Nc3.

Magnus Carlsen made an interesting comment when he streamed playing Pirc: White players (at his level) seems to think they have to mate black almost immediately. Mostly with some variation of the 150 attack going after the bishop on g7, and storming the king from the get go.

The 150 attack is the biggest problem since it means problem to castle kingside, and also the queenside pawns are needed to attack white's king when castled queenside after Qd2.