Most of the PSU’s are made by a small group of manufacturers, and resellers simply buy those manufacturers PSU's and then rebrand them as their own products. I usually buy SeaSonic because pure and simple they are a manufacturer. They make all their own PSU’s and sell them to consumers. So going with a SeaSonic PSU is almost certainly to be a safe bet. I also found that resellers generally offer three to five-year warrenties on their PSU's, and Seasonic offers in many cases five to twelve-year waranties. This alone tells the story and in how much confidence the reseller usually has towards its selected manufacturer.
In turn CORSAIR is a true reseller, not a manufacturer. This can be a big deal. They buy their PSU’s from their original manufacturers so the quality of their products ultimately depends on their original manufacturers or perhaps those manufacturers which returned the lowest fabrication bid on a large CORSAIR factory order. It can be difficult to find out where CORSAIR’s PSU’s come from as CORSAIR has routinely been using 3-5 different manufacturers and in diffrent countries. In time likes these where high wattage and or premium PSU’s (1200W-1600W) may easily exceed $400 plus to especially feed the upcoming 4000 series GPU craze, picking the right PSU becomes important! As one of the dealers at the recent computer show noted: “SeaSonic principally specializes in PSU’s while CORSAIR markets and sells hundreds of different products. “Go take your pick!”