Notes on each: Zotac has less name appeal than some brands like MSI and ASUS but they have proven reliable and this particular 1060 has the cut down 1080 die and GDDR5X VRAM which is very OC friendly.
XFX has always been a good AMD GPU manufacturer and the top option Sapphire has seemed to have some reliability issues in the 480/580 series in my research.
You can go to a 1070 AT $300 and it will easily beat both but the cost is less effective.