A 970 is comparable to a 1060 not the 1050 Ti. Unless you need a card that requires less power, or prefer a new card rather than a used card, the 970 is the better choice.
Real world gaming benchmarks show that the 970 tends to be a bit faster.
Does that make it better for recording your game?
I have no idea as I don't record my gaming BUT... one would think that the faster card would be best.
A 970 is comparable to a 1060 not the 1050 Ti. Unless you need a card that requires less power, or prefer a new card rather than a used card, the 970 is the better choice.