I've got to say Wars. It brings a whole new style to the series, and the gameplay is unique, but not in a gimmicky sort of way. It's actually fun to play, and I kind of wish Hudson would do more with the idea. Unfortunately it didn't even make it out of Japan.
Wasn't Wars also a Saturn game? I'm almost positive that it was a Saturn game.
The only PSX Bomberman game I played was Fantasy Race, so I guess my vote would have to go to that. :P
_________________ The Local Video Gaming Lunatic
Recent stuff I'm into:
Watching: A Certain Scientific Railgun (ep.14, stalled), Hoshi no Kirby (ep. 71, stalled), Nazo No Kanojo X (ep. 8), Acchi Kocchi (ep. 8)
Reading: nothing