Everyone hates 650b in a way that they don’t hate 29ers, and 29ers involve some worrying compromises ( rear mud and mech clearance, toe overlap at the front, stand over height etc). 26ers have no apparent disadvantages whatsoever.
????? every bike has compromises, the 29er compromises above over played, mud clearance is fine, mech issues are resolvable, toe overlap!! never known it, stand over height, not and issue on any of my frames
My gut feeling is that 26″ is the long term bet. And let’s face it, when did you last hate riding on 26 inch wheels?
personally I hated my 26er, but that’s just me, bikes are good or bad based on their design rather than the wheel size