Hey there! I'm split between a 5700 xt for 350$ and a 1080 Ti for 400$. I'm trying to make a choice that would allow me to sell the cards down the line in 2 yrs or so for the least net loss.
Tom's gpu hierarchy chart shows the cards to be similar in performance with a slight edge to the GTX1080ti. https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
A quick look on ebay completed auctions shows the GTX1080ti to sell for perhaps $400-$550.
RX5700XT is in the range of $350-$400.
In two years hence, who knows.
Nobody knows what the market for either of these cards will be like in two years; the best anyone can do is guess. Both probably will not retain their value very well when both AMD and Nvidia release their next gen cards in a few months.
Tom's gpu hierarchy chart shows the cards to be similar in performance with a slight edge to the GTX1080ti. https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
A quick look on ebay completed auctions shows the GTX1080ti to sell for perhaps $400-$550.
RX5700XT is in the range of $350-$400.
In two years hence, who knows.