We still have both but they aren't hooked up at the moment (
though I do have emulators for them). I'm more familiar with the SNES games, but there was still some games I loved on the NES: Legend of Zelda, Battletoads, Megaman, Duck Hunt, Simpsons Game, Tiny Toons and more.
I played and spent a lot more time on the SNES games though: Secret of Mana, Demon's Crest, Megaman X, LoZ: A Link to the Past, Donkey Kong Country 1&2, Illusion of Gaia, Super Mario World, Yoshi's Island. Sooo many!