570/580 are great for ETH, but they admittedly a major pain in the ass to set up. AMD has been getting progressively harder and harder to mine with. I have 6870s and 7970s that were so easy to mine BTC and scrypt with, and then monero. I was able to mine ETH but only with some fuss on R9 380s and 390s. RX 470s needed bios mod and lots of tweaking on each card, and the 570/580 are even pickier.

If you're willing to put in the time tweaking then go AMD. If you want to set it and forget it buy the 1060s and buy ETH with the equihash coin you mine.