I've owned both, and I dig the RR more. The Kelly feels weird sitting cause of the big upper horn, and tilts forward when hanging on a strap. People complain about sitting with a V shaped axe but I don't think It's a problem, just set your leg into the crotch of the guitar and it sits fine. Both have nose dive probs, but a good leather or cotton strap fixes that, they're just not balanced like a strat.
All in all there both cool, I'd try and find a couple to try out first.