Which one to go for Zotac GTX 1050ti OC 3GB vs Zotac GTX 1060 3GB for this setup?

Solution
Well, IMHO, you will be paying premium for GTX 1060 3GB—it's the price of GTX 1060 6GB. Get GTX 1050 Ti—your CPU will bottleneck both of them anyway, but you will see a huge difference from HD 7750.