I have some mining rigs going, but i'm fairly new to this.
I don't understand why
https://whattomine.com/ and
http://www.coinwarz.com/cryptocurrency are giving me different results on their profitability calculators. One says I should be mining ETH and the other says ZEC. I hear murmurings that maybe i should be on XMR.
I've been mining ZEC the last few months. My electricity is free as it's included in rent on my industrial offices.
I have the following cards mining, spread over 5 rigs:
1x RX480
2x R9 290X
2x R9 280X
3x R9 270X
So, what should i actually be mining???