Well, being a person who likes music to be loud, energetic and kinda fast:

FF7's boss theme, Sara Ni Tatakau Monotachi (as its original title goes, though people tend to meander between "Still More Fighting" and "Those Who Fight Further"; SMF is an unofficial translation that was used until The Black Mages did the TWFF arrangement, and since the latter is an arrangement it's hard to say if that's the original official title)

Although I like most of FF7's soundtrack in general. It takes the idea of a chiptune to a different level.