I did a quick math and it appears the 1060 is a real champion
in the Hash for watts race:

Numbers are approximate,
depending on the make and luck:

RX470 - 115W- 26Mhs = 0.22mh/W
Rx480 - 130W - 29Mhs = 0.22
RX570 - 115W - 29mhs = 0.25
Rx580 - 130W - 30mhs = 0.23
Vega56 -200w - 37mhs = 0.18
Vega64 - 220W - 40mhs = 0.18


1050Ti - 65W - 15mhs = 0.23
1060 -   80W - 24mhs = 0.30
1070 -   110w- 30mhs = 0.27
1070Ti - 130W - 31mhs = 0.23
1080Ti* - 200w - 50mhs = 0.23

*(with ethlargement)