I am looking at upgrading my RX 580 with either the 1080 or 1070 TI. Since the price is relatively close, what are the reasons to buy one vs. the other?
The 1080 is a bit better, as shown on userbenchmark: http://gpu.userbenchmark.com/Compare/Nvidia-GTX-1080-vs-Nvidia-GTX-1070-Ti/3603vs3943
You could probably OC the 1070 Ti to reach the level of a 1080, but then an OC on the 1080 would open the gap again. At the end of the day, the 1080 will be roughly 10% faster.
I'm upgrading to the 1070ti tomorrow from a used 950 I got when GPU prices were crazy.....I too thought about getting the 1080, but a 1070ti should get me the 240fps on Fortnite @ low settings so I'll save the extra $$ and upgrade sooner to the 11 series.