For me, I think all the high end radios will do about the same thing. They are all very nice radios. Try to find some guys at your local track with the radios in question. Go by how they feel in your hand and how the menus feel to you scrolling around.
If the greatest radio in the world feels like crap in your hands, how great is it? That's the question.
I have a M8 with Spektrum, you'll have to pry it out of my cold, dead hand.