None of them. Every franchise listed is either long dormant, or over the hill. By over the hill, I mean the best games of these franchises are behind them. Subsequent games in these respective series will either stay the same quality or get worse over time. I expect Forza to stay about the same quality, and the rest of the series to more or less get worse as time goes by. Halo 1-3 and Reach beat Halo 5. Gears 2-3 beat Gears 4-5. Elder Scrolls isn't exclusive, and has been dormant for 9 years. Fallout jumped the shark with 76. Banjo Kazooie hasn't got a mainline collectathon platformer since the N64. Killer Instinct and Fable have both been long dormant.
If MS can successfully resurrect Fable, KI, or Banjo I'll change my tune. By successfully resurrect I mean make a great new game out of these series, not make a game that goes on to score 77 or 63 with critics. I have hope that they will do just that next gen.
You know, you could always just keep your opinion to yourself instead of shitting on Xbox every chance you get. This thread is about you're favorite Xbox IP, if you don't have one, don't say anything.
It's like if someone made a thread about everyone's favorite Kingdom Hearts game, and I said, "None of them, they all suck." It adds nothing to the topic besides my annoying/shitty opinion on something I'm not even interested in. Right now, this is you, but you disguise it by trying to be clever and added a few extra words to make it not come off as trolling, but all you're really say is, they all suck.