I also started out by playing the Spanish and then moved on to playing the Italian ... not the most recommended order of adoption, by the way, but we can't change the past.
The Spanish has one thing going for it that the Italian does not, namely, that nagging pressure against e5 that severely limits Black's freedom of choice for the first half dozen moves, while in the Italian, both sides need to be mindful of possible early tactical skirmishes. That's the only difference in general between the two openings. Nowadays I think the old lie that only the Spanish offers White any chance for advantage after 1.e4 e5 can be laid to rest; every opening - with best play by both sides - will reach equality, just that they do so by different routes, so what matters is to choose the route you like best.
I've played every variation of the Italian, and I love it all. but then I also like the Spanish, the Scotch, the Four Knights, and even the Ponziani.
Hey. I've been playing the Spanish basically since I started chess.. Have over 600 games on this site in the Spanish (many just blitz games). Lately I've taken up the Italian with just under 200 games played.
I love the Italian! Taking aim at the weak f7 square right from the start, makes a fun game.. it seems to present way more tactical opportunities. After the 2 most popular responses to the Italian 3. ...Bc5 and 3. ...Nf6, white has the choice to play very aggressive games! First the Evan's Gambit, and if 3. ...Nf6, white can try 4.
d4 trying for the Max Lange attack. I found the Spanish to be slower, and often becomes a very positional game full of knight moves.
Who else has tried both these games?? Thoughts?