I've only played N64 games that are on the NSO. But the one I spent the most time on and enjoyed the most has to be F-Zero. I love it's fast gameplay, smooth frame rates that allows to race against 29 other races and the whole risk-reward aspect of it. Plus, the expansion kit adds even more stuff which is so cool (granted, I haven't played this one, but it's like the best version). Another game I appreciate alot would have to be Mario Party 3.

OOT

Mario 64

1080 Snowboarding

Doom 64

Majora's Mask

Mario Kart 64