Wow the NES Batman: Return of the Joker arguably looked better than the Genesis version. Maybe not in a technical sense, but I find it more pleasant to look at.
I always thought Little Nemo: The Dream Master had great graphics. They were amazingly colorful and the characters had awesome design, especially the cigar-smoking gorilla!
I played that game so many times when I was a kid. I could never beat it though because it was surprisingly hard. I'll have to bust it out someday to see if it's still a challenge.
I meant that it was interesting with respect to game consoles. The only comparisons I can think of in that realm are the GB -> GBC, GBA -> DS and GC -> Wii.
Since '8-bit' hasn't been defined in this thread; then I suppose the above 8-bit colour definition can apply!
A common definition would be the number of 'bits' the GPRs (General Purpose Registers) can hold within the CPU... but "8-bit" is very vague and not very meaningful to compare architectures with custom chipsets...
Also "best" hasn't been defined; so there'll be plenty of variety between 'static' screens and 'dynamic' vids...
Anywho, I'm of the mind to say that Wizards and Warriors, Bionic Commando, and Ducktales are the ultimate 3rd party NES games in terms of graphics and music. Virtual Console needs to get in gear.