I'd say SNES wins because TMNT looks and plays closer to the arcade, and Contra 3 is more aliens less robots, and isn't as crazily difficult.

But Bloodlines over Castlevania 4 any day. The sprites are smaller but I find the the Genesis installment to have a lot more atmosphere, better bosses, levels, and gameplay.

Contra Hard Corps is a really fun game, but it's way too difficult. Even with 2players we never could get past the 2nd level.