I voted for both the Puyos and Panic Bomber. None of the others even rate, IMO. Even Panic Bomber was a bit of a sympathy vote, its not that great.
Puyo Puyo Tsu is tied with Super Puzzle Fighter IIX IMHO for best versus puzzle game ever, Saturn versions, of course. Tetris Attack (SNES) comes second.
There is always Tetris (GB), which has a zen like perfection you just can't beat, but its not so great versus.