Is the RR more gainy than the Stormy?
Not that I've noticed. It might be at extreme settings, but with the pickup heights being similar they're about the same. The SM bridge has had no trouble keeping up with the RR neck.
That's pretty much my experience too. I haven't tried mix and match, but I have one SG with RR and one with SM.
The guitars feel and play very differently but don't sound hugely different when amplified. Same amount of gain/overdrive for the same amp settings. Both do Angus very well. If anything, I'd say the SMs do it better!
My personal preference (as a set) is the SMs. I'd say warmer/sweeter when compared to the RR colder/harder.
I can certainly imagine a SM/RR combo working well. I like the vibe of the SM neck, but if I wanted a bit more bite, then I'd think abut putting the RR neck in next to the SM bridge. Bridge versus Neck would definitely work ok for me, not sure what the middle blend would sound like, though?
