Going from a 1050Ti to a 1060 doesn't make a huge difference, from what I understand.
In fact, in Doom and Hitman, the 1050Ti outperforms the 1060 3GB slightly. In Rise of the Tomb Raider, the 1060 3GB just BARELY edges out the 1050Ti.
In most other games, the 1060 3GB will outperform the 1050Ti.
Take a look at this review - it's for the RX 5xx cards, but includes the 1050Ti and 1060 (both 3 and 6 GB) among others, for comparison.
http://www.tomshardware.com/reviews/amd-radeon-rx-580-review,5020.html