4 x 1070 are far better because of density and because mining with cheap gpu is not that good now with this high reward i would choose 2 x 1080ti over the 1070, they are even better
just thank you for your answer,
so do you think its better to go with 2x1080ti for now?
also which edition is better for those cards?
also i've checked at nicehash calc and 1x1080ti is doing only 8.21 USD/Day when 1x1060 6gb does 4USD (6x4=24USD/Day) hmmm...
don't go with nicehash they pay way less, a 1080ti can do $13 or more on skein/x17 or other algo where it hash very high versus a 1070, i think for the brand you can't go wrong with strix or gigabyte