I've had two Spektrums, DX3R and DX3R Pro, both worked great and never an issue. I replaced my Futaba 3PK and 3PKS with them and never looked back. They did everything I needed and weighed significantly less which is what I needed for long nitro mains. I've been using the old DSM modules in my Futabas with never a problem of range or anything. I use a Spektrum DX6i for my three Helis and never had a crash due to the radio.

I bought a Futaba 4PL for my crawlers because of the built in programming and low cost receivers. It works just as advertised.

I've also owned Aitronics but never felt comfortable with the hand position and the top heavy feel. Hitec Lynx was just so-so but cheap. My old Futaba Magnum Jr. is still functioning but who uses AM anymore.

So it really comes down to what works for you.