Personally, I wouldn't recommend either of them. What is your maximum price range?
https://www.powerc.com/ is a good website, you can build your own via the website. Works out cheaper also. There are many websites similar to this, doesn't have to be that specific website. I wouldn't buy a second hand computer, they could of overclocked it and burnt some of the parts, this has happened in many occasions for second hand computers on Amazon.