What controller are you even using with an android device that can properly mimic an N64 cuntroller? Also, I find more replay value in SNES and GBA games than I do in N64 games.
+1 for Mupen.
favorite is the moga, doesn't properly "mimic" a true 64 controller but why would you want to burn the palms of your hands?
Cheap alternative is the ipega one, but it isn't flat.
Also if your game only uses 2 or 3 buttons you could get away with the gametel or any gamepad.
You want this if you don't want to bring your laptop but need your 64 fix.
The only games worth emulating and are actually playable on phones are rpgs, VNs, and pokemon.
Prove me wrong.
PROTIP: You can't.