Look at the warranty. It is impossible for a PSU to be better tan the warranty.
Only thing I have to say about this is that, how much would it matter if the hardware being powered fries, as for I have heard people make claims that some warranties only cover power supply replacement, but dont cover frying your brand new Core i7 and 1TB SSD with 64GB RAM and nVidia Titan X video cards for example which would be quite a serious loss of money. So is it really worth the gamble in cutting corners in one of the most critical components of a system build, upgrade, or repair.
I myself only use the free ( with computer case purchase) and low quality power supplies in systems that are worth less than $150, and only if I dont have a better power supply available and I am looking to save $50 etc. Low quality power supplies can over voltage or under voltage hardware. Over voltage fries stuff, under voltage causes instabilities and blue screens and lock ups and corruption of hard drives and SSDs.
Many of the better quality power supplies do have good warranties though as for the manufacturer has trust in their own quality that the power supplies should last longer than the warranty period. But basing a purchase on just the terms of a warranty is too dangerous. I wouldnt cut corners in quality on an important system component that can take the entire system out for a total loss.