All best left in the past. Would've rather had fighters megamix than Sonic fighters or Fighting Vipers. Got VF5 and VF5FS so VF2 is pointless
I've got VF5FS on the PS3, but I still slightly prefer VF2 (with VF3 being my series favourite). The levels i.e. fighting arenas feel more tailored to the character personalities compared to the relatively bland and generic levels of VF4 / 5. Also, the controls are a bit more "floaty" in the newer VF games, compared to the razor-sharp controls of VF2. The computer A.I. is also more challenging in VF2, where even on normal setting characters like Lau, Pai and Lion will punish you with brutal combos if you don't watch out. Graphically, VF5FS of course easily has the upper hand though and it's got online play too.
Fighting Vipers with its walled arenas and ensuing interesting fighting mechanics is still fairly unique as far as I'm aware of, so a rerelease seems worthwhile. The graphically superior Fighting Vipers 2, which was released also for the Dreamcast, should get a rerelease as well... as so many other Dreamcast titles.