Saturn by a country mile. The N64 had some outstanding games, but not a lot of depth to the system library. Pretty much everything that Nintendo published was terrific and every other game was dreadful. You can make an argument that the Saturn didn't have a game a good as Ocarina of Time or Majora's Mask, but it had the Panzer Dragoon games, the Shining games, Dragon Force, Guardian Heroes, Burning Rangers, Nights, Mega Man X4, and a slew of arcade ports featuring some of the best 2D and 3D fighters. I'd say that the US Saturn library beats the N64 pretty handily and when you figure in the Japanese imports like Princess Crown, Grandia, Castlevania, Soul Hackers, Policenauts, Radiant Silvergun, Tactics Ogre ,the Langrisser games, the Lunar game, ELevator Action Return and the Dungeons & Dragons Collection it's not particularly close.