Or maybe I'm just nostalgic...
But well... I'm mostly referring to FFVII, FFVIII, FFIX and FFX because it is mostly those games that I was interested in as a teen.
"One Winged Angel" is iconic. (as iconic as the victory fanfare that appears in a lot of games of that franchise)
"Eyes On Me" is a song that I really like.
And I once almost had tears in my eyes, when I randomly was thinking about that song.
"Melodies Of Life" is a good song. And I remember being surprised that Emiko Shiratori, who sings that song, also sings some of the songs from the 90's Moomin anime.
"Suteki Da Ne" is a beautiful song and I also kinda like Lee Soo Young's Korean version of that song.
And I also like "To Zanarkand". I remember back hen when I wanted to learn playing it on the piano.
"Real Emotion" and "1000 Words" are songs that I like too. Especially Koda Kumi's version.
Well... "Aria di Mezzo Carattere" from Final Fantasy VI is good too.