I have 2x gigabyte aurous and 2x gigabyte aurous extreme  1x zotac amp extreme core and I am satisfied with all of them they all give approx the same hashes at similar overclock  under Tdp
gigabyte has better temperature but the fan speed is faster
Anyways whichever 1080 ti u get except the blower fans , will most like give similar performance , hence get the cheapest one available or which looks appealing to you