It depends on the model. Both brands have quality PSUs which I would buy and another ones that I wouldn't.
Both PSUs you have selected have been made by the same manufacturer: Enhance Electronics, which is a good one.
Anyway, in this case, I would go for the Silverstone Strider Plus 1000W. The +5V output is cleaner.
In the database of my signature you can find some reviews about those two PSUs.