I love both systems. BUT
The NES has aged so much better than the N64. To explain what i mean by aged, i just mean to this day NES games are still incredibly fun, easy to pick up and play, and look just fine because of their 2D nature.
The N64 has so many things about it that just aged badly, especially after being spoiled with modern gaming. To be fair this isn't the N64's fault, for the time it was pretty amazing IMO and was pretty ambitious. But the beginning of 3D games was just an awkward era, especially for the N64.
-Terrible camera systems
-Horrible fog in most games
-Movement and controls were awkward in a lot of games
-Contoller was awkward
-And it just overall doesn't look too great
You didn't have to really worry about fog, muddy graphics, and terrible camera systems in 2D games. So it honestly isn't too fair of a fight. But if they are in the ring, the NES aged far better, hands down.
Side note: I think the SNES will go down as possibly the best aged system ever made.