I'm not entirely convinced that response time as most people are thinking is as much of a differentiation as it might appear (at a certain level). I'm not suggesting to forget all the stats and just buy cheap stuff, but I wouldn't let those be the deciding factor. I believe some companies have more money to spend for sponsorship so you'll see more of a brand because who doesn't want free equipment. However, it still has to be decent as they aren't going to use junk but other equipment will be just as good. For example Dakotah Phend races using a Spektrum DX6R and it's not slowing him down. Many people are finding the Flysky Noble NB4 to be just as good as more expensive options:

https://www.rctech.net/forum/radio-e...l#post15547955