Amd I would have to agree with you. They both have their perks. Personally, I prefer AMD software versus Nvidia. Catalyst has it's strengths...
Application I have 2 GTX680 FTW+ cards. In BF3 and BF4 my GPU Usage was always between 70-90%. I finally found out what was doing it. Teamspeak....
3 5870's.......just my opinion though.
Hardware Correct me if I'm wrong but last I knew, WOW doesn't support Crossfire or SLI. Having said that, I have a Sapphire 6970 with 3 1920 x...