
PS1. Just on the RPGs alone it probably had my favorite library of games, plus all the fighting games and titles like Resident Evil. It was the first non-Nintendo console I ever had.
As for N64, Super Mario 64 was fantastic.The Zeldas were groundbreaking, but I enjoyed Twilight Princess and Wind Waker far more than I did Ocarina of Time or Majora's Mask. There were also a couple of under-the-radar gems like Ogre Battle 64, Harvest Moon 64, and Mystical Ninja Starring Goemon, but the N64 is my least favorite Nintendo system of all time (setting aside Virtual Boy, of course).