Keep in mind that they are the
same exact gpu. The only difference is the cooler, and the EVGA can cool beter.
That isn't to say anything bad about the Gigabyte card at all. It's a very good card. The EVGA just has the better cooler.
If they're the same price, get the EVGA. It's not clocked as high out of the box, but it will boost high because of the lower temperatures. You'll get better performance out of it than even what's listed on the box.
If you won't overclock the card at all, ever, then just get the cheapest one with the fastest clock speeds. But if you'll overclock, then the EVGA Hybrid is the best one to get between those two.
As for a third option, have you considered the 980 ti Zotac Amp Extreme? It's the fastest 980 ti out of the box, and the cooler on it is very good. It's actually good enough so that temperatures won't be the reason your overclock fails. It'll just be form too much electricity running through the chip.
In the end, though, all of these cards are going to perform VERY SIMILARLY. Just balance things according to your budget and whatever else matters to you (e.g. how the card will look in your case if you have a case window). You just have to like it, and because all 980 ti cards will have similar performance, you can consider things other than performance in your decision.
