I’ve raced casually for the pass 3 years. Then went all in back in July. And until recently I pretty much too controllers as basically similar. But have found there’s definitely more difference then I thought. I’ve had inconsistencies from Spektrum( older Dx3s models). Some receivers worked fine. Some had dead spots that just couldn’t get solved. 2 years ago bought a Futaba 4PL. It’s been a fustrating experience at best. Confusing as it seems to have different terminology then others.

4 months back I bought a basic Sanwa Mx6 just to get my off road stuff on to a single controller. Seemed good at first. But as I improved, I could tell something wasn’t right. So I’m now looking to move again

If you can, trying something before buying. I know it not always possible.