Blizzard games do run better on NV (a few years back they had journalist go to their studio, and all the rigs were NV powered as expected). But it runs well on AMD as well. It's not like other GimpWorks games where the gap can be hilarious. haha
I got a good deal at my local retailer. I tested Gsync and Fs, and it doesn't do much for me, because I run at a frame rate cap of 60, and disable vsync in-game. Settings are tuned so that it stays ~60fps all the time. If frames drop to 40 or so, it feels less smooth in general and I don't like it. So whether its Gs/Fs, it's still not optimal to have low frame rate to begin with. The best gameplay exp is a tuned one where you get 60+ fps.
In TF and TF2, my best class was the Soldier, so I went with Pharaoh, she's basically the same thing except she can hover longer. The ultimate is very good when enemies are escorting and bunched up... quadruple kills!