Evga 500w 80+ or xfx xt 500w 80+ bronze
Which one is better and why
The EVGA, simply because we don't know how the XFX compares to it (lack of proper reviews).
XFX XT is likely a rebranding of an unknown Seasonic model.
Jonnyguru had a thread but they never confirmed how nice/bad it is or which model it actually is inside.
It does come with only a 2 year warranty though which is enough to repel many buyers.
Go with EVGA, Since EVGA is actually a very trusted PSU model.