FFVII > FFVIII

Reasons :
Better main cast, Better OST, Materia brought alot more stratergy, Didnt have a daft system ( monsters leveling with you ), FFVII had a better story, sure FFVIII's did have a pretty good story but FFVII's brought plot twists and such makiing you want to play more, also FFVII's over all world has more story with all the sequels FFVII is getting.