I plan to play GTA 5 at 1080p resolution. Will it work fine?
The MSI 1060 is the customer choice on new egg while there are few complaints about the RX 480.
Although the performance is the same, I am confused over the memory they offer. Should I go for 8GB (future proof) or for the 6GB?
GTA being DX11 the 1060 will be a little better. But overall the performance difference is so close it comes down to personal preference. Nvidia and AMD handle memory differently and I have seen some reviews that show at the same setting Nvidiai cards use less Vram than AMD but at 1080p it's pretty much a moot point.