zotac gtx 680 4gb vs gigabyte gtx 780 3gb

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Jan 4, 2016
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Title says it all but for context.
I'm building a LGA 1155 gaming PC because I'm on a $400 (aud) budget. So both are used and I'm looking at these cards because I was gonna get a 750ti but I want more than 2gb vram and I like older cards becausedealwithit.
Prices:
Gigabyte gtx 780 3gb - $220
Or
Zotac gtx 680 4gb - $200
So now I know that both of these cards are still beasts (maybe not you you lot with the obsession with ultra graphics and 60 fps ) but these cards are perfect for me now I'm already $20 over budget with the 680 so my question is - is the 780 that much better and if so is it worth the extra $20 I'm gonna have to scrape together.