For me it was FFVII simply because that is my favorite game of the series, and I loved finding out what I would get back in the day - I remember that I would make sure to steal from each enemy, and then finish them off with Morph to see what I got both times, and I loved doing so (I used cheat codes, because I suck at gaming, so it was pretty easy for me to do this.)

But yeah, I loved finding out what each enemy had (or became) during FFVII.