If anyone tells you one specific graphics card from a specific vendor is the "best" they are probably biased one way or the other. All the 1080's will perfom about the same some of the vendor cards like the FTW have bigger cooler and more VRM's for possibly better overcloking headroom. All the cards from reputable company's are pretty good like the msi gaming x, zotac AMP, asus ROG, to name a few.
Get whichever best suits your build and budget, that would be my recommendation.