Id choose gtx 770 but the 4gb version is pointless as a single card cant use all thst vram. Buy a 4gb edition only if you plan to sli later
Btw dont use gpuboss to check comparisons, its one of the worst websites ever.
It honestly depends on whether you prefer the AMD or Nvidia cards/ whether you can afford the bit of extra money to get the nvidia card, so get the one which you are more comfortable with