Ok this battle of the systems is based on the following games. All by konami.
All these games are classics. Try not to let nostalgia get you and try be impartial. It's easy for me since I only owned one of these games the first time around.


Snes
contra 3
Castlevania 4
Turtles in time

Vs.

Genesis
Contra hardcorps
Castlevania bloodlines
Hyperstone heist



My vote goes to genesis. While not as pretty these games seem more fun and interesting to play.