This is a debate that will continue on forever so long as both companies are making radios. It's like Ford vs. Chevy. Each side has its die hard defenders. Fact is, your DX6i is a fine radio. It's what I have had for a few years now and haven't had a single problem whatsoever. Since you already have a Spektrum radio and gear, just stick with it. Save your money for more planes, or whatever else you want to spend it on.

The only reason I'd upgrade, is when my radio can't do all that I need/want it to. Until then, I'll keep on happily using my Spektrum.