Puyo Pop Fever is one of my favorite games of all time and I consider the fever ruleset to be the best of the series.
I've played Fever and several variations of the original game that aren't actually the original (Mean Bean, Avalanche
, and Mania)
I also played a bit of the GBA game.
I didn't play Puyo Tetris because it didn't seem to have the overwhelming energy
of earlier titles with it or the actual fever ruleset as far as I could see? Just endless fever. It seems like a decent title anywho.
Puyo is my favorite puzzle series, and I'm pretty picky (I've never really liked series like Tetris or Dr. Mario).
In fact, it wasn't until very recently that I tried Puzzle League/Panel de Pon and found something I liked almost as much.