Having just recently played both the genesis and snes versions extensively, to add to this OP, as far as the games themselves are concerned, I noticed that the genesis version plays a bit smoother. As if it's running at a slightly higher framerate or something. Gameplay is a bit tighter on genesis. On snes players feel a bit "heavier", they glide further and faster when you press the check button. It's a bit easier to score on the snes version. For it's time, the graphics and sound were way better on the snes. The players are smaller but I guess the idea was to make it more proprotional to the rink which is cool. It opens up the rink, but I guess EA made up for that by making the players a bit too fast and "heavy" in my opinion. I noticed that it's easier to make a pass in snes. I get a higher percentage of successful passes. I didn't notice any difference in button response time between the two...