I'd have to say Kingdom Hearts. Yoko Shimomura's music is absolutely amazing. My favorite tracks from all Kingdom Hearts games are Hand in Hand (RE: CoM version), Destiny's Force, Sinister Sundown, The 13th Reflection, The 13th Struggle, The Other Promise (absolutely amazing. <3), Naminé and Scythe of Petals. Rage Awakened, Forze Del Male are also amazing and Hollow Bastion shouldn't be forgotten either.
I also like Nobuo Uematsu and especially his compositions for Final Fantasy IX. Loss Of Me, You're Not Alone, Protecting My Devotion, Battle Theme (Final Fantasy IX), Hunter's Chance, The Man With the Machine Gun, One Winged Angel and J-E-N-O-V-A and Jenova Absolute are my favorite Final Fantasy tracks although he has also composed a lot more awesome music.