Definitely the Saturn. It was a third degree burn on Sega's part. Though the fact that Sega kept putting out new peripherals for the Genesis that were touted as next gen didn't help. The N64 wasn't as big of a stumble for Nintendo because it still gave us some of the company's most innovative games (Super Mario 64, The Legend of Zelda: Ocarina of Time and Super Smash Bros. to name a few). PS3 was still a bit of a stumble for Sony because of it's unreasonable launch price and poor lineup of launch games, same fiasco happened with the Xbox One, but at least Xbox One brought back Killer Instinct.