A 1060 is good enough for Most people to play on 1080 Currently. A 1070 will grant more longevity of your laptop and better "future proofs" it. It really depends on the budget, and how long you want the laptop to last. I would recommend the 1070 if you want the laptop to last more then 2 years and you are not crunched for cash.
Note a 1060 may still be able to play games 2+ years out. Without specific models I can't give more non general advice.