Both of these companies have been on top of the dog-pile many times. So many times before, that it's old news when it happens again.
I'm looking for the best bang for the buck (what I can afford) that is available when I'm ready to buy new GPUs.
The last time that was a EVGA GTX-760 4GB ACX card.
The time before that, it was a pair of R9-280X OC cards that are being used in crossfire.
My Radeon products (the 280X cards and an old XFX-6870 Black) are running fine for me. The gaming is pretty sweet too.
Likewise, the GTX 760 is a good gamer.
I just sold a pair of GTX-680 cards to make way for a pair of GTX-970s as soon as a matched pair of them is available to buy.
To be honest, if either company wants total loyalty, they're gonna have to buy a Dog. I'm in it for myself.