Contra 3 has some pretty graphics, but overall the game is only average IMO (with a few key good points). It is what it is - an early SNES game.
Hard Corps is a great run 'n gun action game, chalk full of nice effects and explosions to boot. But the graphics themselves are kind of ugly. They fall short (even for a Genesis game) IMO. It's very low shading with lots of contrast - like an NES game. After getting over the flashy-ness of Hard Corps, the color choices start to bother me and so I don't care to really play it anymore. That and the over modulation in the FM instruments is grating on my nerves after awhile. As much as I don't care for the SNES one, I rather pickup and play that for 10-20 minutes or so over Hard Corps.
SCIV is a pretty looking game with an incredible sound track, but the game is slow and the animation is dead minimal (even down to 2 frame animations for enemies). Bloodlines are average at best and below average in a lot of areas. This annoys me because the game came out late in the Genesis life and could have looked soo much better. That game itself is OK, but good amount of the bosses are lame. I could have overlooked the graphics is the game design itself was of Konami's level of quality they normally are known for. Overall it's a let down of a Castlevania game, so the edge goes to the slower paced SCIV.
I haven't played much of either TMNT games on the SNES or Genesis, and from what I have played - both seemed equally fun (throwing the enemy at the screen is only cool at first, else it's gimmicky and not really needed IMO).
The SNES gets the slight edge in this case (though overall I'd probably pick the Genesis).
That's about as absurd as trying to pick a system based on 3 games for each system. There's no way this thread can (or should) be taken seriously.Try not to let nostalgia get you and try be impartial.