fluff-the-tiger

"And really, marketing was all it was. The actual difference in CPU performance between Sega' 8MHz 68000 and Nintendo's 3.58MHz 65c816 was almost negligible."

Were you actually alive when both these systems were out?
The Genesis' processor was a LOT faster, however the SNES was loaded with custom graphics and sound processors which, once developers got to grips with them after a couple of years, allowed SNES games to be more technically impressive.

(see the constant slowdown of the first SNES games released, e.g. R-type)