I believe you can get 300 H/s at 100W or 370 at 150W. I can't confirm as I don't own any. Also, Claymore is AMD only.
Yeah, that probably sounds more realistic... If that is the case, it would seem the 1070 is only a little more efficient than the RX 480.
RX 480: 100 watt consumption / 230 sols = .43 sol per watt...
GTX 1070: 150 watt consumption / 370 sols = .41 sol per watt...
Now, I guess for someone with a huge power bill, that would make sense for multiple rigs. But on my end... With only about 4 cents per kilowatt hour, I would need to get a 1070 for $350 or less to meet the same ROI as an RX-480. Plus, I only have two rigs.
I guess for multiple rigs, high power cost etc, it makes sense to go with 1070's. Less power consumption, more hashing power on a single rig (less boards, CPU and RAM to buy, etc... Not so much for me though, at least at the moment... Though if I could find a 1070 for $350, I'd buy several in a heartbeat considering all those factors...
370 at 150 watt is not the good choice, do 300 sol at 100 watt, that is 0.3 sol per watt, actually i'm not sure about the 150watt with 370 sol, it could be less, my gpu can't reach that speed you need a palit