Hi
1. There are different gpus I should choose over others for different coins?
Or the different is only abut the hash rate?
If the answer for (1) is yes, how do I choose the best gpu for the coin I want to mine?

And my specific question:
2. I have 6 MSI 8gb gtx 1070ti, and I’m building my first rig.
There are coins I should prefer to mine with these gpus?