The third console curse: Which was the biggest stumble?

[firebush03]

I forget the history with Sega during the 90s...from what I can recall, the Saturn was a powerful system (for its time) which had no mainline Sonic game (or no game of high quality). May not sound like a big deal by today's standards, though imagine if Mario was absent from NES/SNES/N64 (any one of these systems).
Since I'm more informed on XBOne, and relevancy bias has me still feeling the effects of XBOne's blunders (unlike Sega Saturn which knocked Sega out of the console industry exactly two years before I was born), I vote XBOne.