Should I get the RX Vega 64 or GTX 1080?

[Pemalite]

Chazore said:

I wasn't using my 980 at 1440p at the time. I also have a 1080p 60hz monitor which I was running GTA 5 with at the time. It was not sufficient for 1080p, not with the 980 paired with the i5 4670k with 8gb DDR3.

Then something was wrong with your rig.
Ancedotal evidence isn't sufficient evidence.