i love the ff8 and ff10 music the most, but out of the 2 i would have to say that 8 has the best overall music, 10 has some good pieces, (yunas theme, to zanrakand etc) but mostly its the same tunes just remixed over again. the songs that stood out for me on the 8 soundtrack where

blue fields
shuffle or boogie
man with a machine gun
julia
under her control
fragments of memrories
ami
the oath
and of course eyes on me