RE: Who Sells More Transmitters
I don't see any reason to doubt that Spektrum/JR is the best selling radio, mostly due to getting into the market first and the fact that nearly everyone makes bind and fly models that work with Spektrum/JR transmitters. I'm not real clear on exactly what the arrangement is between the two, but the impression I got was that JR started the Spektrum brand when it released its 2.4ghz technology. As for which is the best radio, pretty much all the other of the big 4 have a good reputation with Spektrum/JR not so great. That said, as long as you use a 6v battery pack and don't get one of the odd radios that can't stay bound you'll do fine with Spektrum too.