I don't Know if i prefer The turbo over snes or genesis. I love the turbo grafx, However I grew up with Super nintendo and Genesis.
The rpgs for snes were amazing like Zelda, super metroid, chrono trigger ect. Then you had the mario games. I got into turbo grafx because it was cool, obsecure and i did not have one as a kid, nor did i even know what it was. The Turbo grafx has a lot of neat and akward titles that peak some interest, i believe this is why it is a "niche system" to some.
I rate the sega genesis the snes and the Turbo grafx 16 as equal for their differences