The 1060 3gb is significantly faster than the 1050 4gb. The differences go well past the amount of vram.1 gig of VRAM is not a big enough to make a choice. Unless every single other specification is the exact same, then of course the 4 GB version is going to be better. But if the processor in the 4GB version is trash and the one in the 3GB one is great, the 3GB is going to win every single day.