S!
I use AMD GPU at the moment and I am happy with it. The "3 blue lines" described are not because of AMD drivers but IL-2:CoD coding. So blaming every glitch in CoD on AMD drivers is plain wrong. I would look at the issues again when Luthier and his team get the GFX engine sorted out.
A thing to remember with AMD is to turn down Catalyst AI to Performance and tick OFF the Surface Optimization. Others leave to Application controlled and MLAA Off. Works for me. I use a 5MHz overclock on my card to make sure the 3D speeds kick in while playing CoD along with deleting/disabling the UBI logo. So far so good..but again this is because of CoD code, not drivers.
I had nVidia earlier, up to 580GTX. Nothing bad to say..just the pricing. Because they are fast the price is in straight relation. Same can be said with Intel CPU's..as they are fastest at the moment they can ask any price they want..the one asking is not the stupid one but the one paying
Anyways..choosing a GPU really boils down to your budget and preferences. I can say both AMD and nVidia produce good cards.