You can't guarantee a particular card will be a better overclocking card over another brand. As far as I know, the Asus Kingpin cards are the only cards that have a guaranteed ASIC (indication of silicon quality, translates into overclockability) quality. Otherwise, it is a crapshoot on getting a card with a good (above 70%) ASIC quality. I received my EVGA card with an ASIC quality of 84.6%, if that means anything to you.
I would suggest buying the cheapest, custom(as in manufacturer overclocked, custom fans, custom PCB) 980 Ti you can find. Stick to brands like EVGA, MSI, Asus, or Zotac