Which USED graphics card should I choose?

[Tech noob]

Hello! I am thinking to upgrade my old, not so good system. I've already chosen the processor, the ram, the motherboard, etc. 

Only thing that still remains is the graphics card. They are quite expensive, so my thinking was I could buy a second hand one. 

So which one should I choose, or maybe not choose. Choice numero uno would be a Zotac GTX 1070 Ti for about 200 euros with expired warranty, and choice number two is an Asus GTX 1070 Dual, not sure about the warranty on this one. The price for this one would be about 180ish. 

Any help is appreciated. 

Based on purely benchmarks I'm thinking about the Zotac one. 

[PopsicleHustler]

1070Ti for 200 euros looks like a good deal. I would go for it.

[Tech noob]

Thank you dude. You helped out a bunch. or maybe just made my decision less scary? Let's see how this goes shall we?  Thanks again, and have a good one.