hello everyone! I have 5 1070, how do you think is it reasonable to mine BTC or better ETH
Wow, you already went out and got 5x 1070s without doing sufficient research?
Directly mining BTC with GPUs is not practical (and hasn't been for years), if you care about revenue. Therefore, of the two options you have provided, ETH is your best bet.
(Or ETC, since that's what your thread title mentioned.)