AMD 100% is the best choice right now if you exclude the shortages. If you can get your hands on 580s for less then $300 or even $400 they're worth buying. They use the same amount of energy as a 1070 (give or take), and you can mine mainstream coins with them to get decent revenue. With Nvidia you have to mine niche coins which are easily saturated or you make like 30% less with a 1070 vs a 580 (Equihash vs Eth+Sia). AMD also has niche coins, which you can also find that Nvidia is bad at.

Mainstream coins offer stability and safeguards against your revenue dropping out from under you, either due to a big miner hoping on it, buy support disappearing, or the market just outright crashing. There is absolutely no reason to buy Nvidia. You offer absolutely no points to back up your argument besides 'Nvidia best4evar'. I mean I want to feel good about the $10k worth of hardware I bought too, but that's not the way reality works.