Question Which power supply is better?

[Giant Hunger]

Ok so my antec 550w psu is faulty or something, there are times that my pc just froze, after i switch back to my old psu everything works normal nothing happens but the thing is i cant use my old psu since it does not have the pin connectors for my old hd 7970.
So i was looking forward to buy a another psu and i had come up with these 2 power supply
The FSP 550w HEXA 80 plus bronze: https://www.fsplifestyle.com/en/product/HEXA85plus550W.html
And the FSP 550w raidar 80 plus silver: https://www.fsplifestyle.com/PROP161000093/
Both are refurbished used psu, both are the same price and have 3 month warranty.
Which one should i buy?

 

[logainofhades]

I wouldn't buy either, new or used.