The GTX 1070's are overpriced for a quantity purchase. Last two I bought a couple days ago were $404 each. Just watch for deals and inventory.
Between the two though, I would probably do the 1070's even at that price. 10x 1070's should net minimum $50 a day so your looking at 110 days to ROI max.
I have a great deal to buy 10 - gtx 1080 at 539$ a piece brand new, another deal for 10 gtx 1070 at 459$ a piece.
I need some advice from people who own rigs of nvidia. Which one of these 2 would you buy and Does it worth to invest 5.5k in this deal ?
Thanks in advance!