NES: Baseball Stars
Genesis: Gunstar Heroes
SNES: Axelay
PCE Duo-R: either Castlevania: Rondo of Blood, Lords of Thunder, Devils Crash, or Outrun..i play em all about equally.
NEO*GEO: Samurai Shodown II
NEO*GEO Pocket Color: SNK vs Capcom: Match of the Millenium
PS1: Castlevania: Symphony of the Night
PS2: War of the Monsters