A 980Ti/1070/2060 comparison review was done last year that shows the 980Ti and 1070 are mostly neck and neck. This comparison wasn't really needed, but interesting to look through.
Spending the around $500 on ebay for a 1070 or around $300 for a 980Ti is just stupid. If you have one and you aren't looking to max everything, even on 1080p and require 120+ fps, the cards are solid 1080p gaming cards, even 5+ years after they've been released.
I'd still be using my 980Ti if it wasn't having high, random fan spin ups on it. I needed to replace it before it mechanically failed, luckily I was able to snag up a 3060 for under $400 about a month back. Otherwise, the 980Ti card still ran everything I threw at it, but also with it 6 years old it's near it's EOL for driver support and the 1070 won't be far behind.
Folks, don't buy a 1070 or 980Ti unless you're absolutely that hard up for a card and can't get anything new.