I'd go with the one that is the smoothest and quietest, as it's all the same hamburger .
My observation is that the Kickr is smoother than the Hammer h1, but the later versions are the same. The Kickr lies to the traininer app on workouts, so it's easier to follow the app workout plan (sprint ramp up / ramp down).

The Neo doesn't have a belt to cause issues. I haven't used one though.Probably the MOST likely to work you into a trainer death spiral if they don't have software around this, which I'm sure they do.

The hammer probably has the most flexible with axles. The heavier flywheel + gearing probably better for sprinting. This trainers flywheel will spin forever after a sprint, so you miss the low power effort on the training app after every sprint.


Look at axle handle / derailleur clearance (bottom and interior)