The Corsair unit is a CWT. It reaches 80 plus efficiency but certification was forfeited by Corsair for the same reasons as the HX series losing gold. It also only has 480W on the 12v rail
The Antec is a 80 plus bronze unit with 650W across two 12v rails made by Delta.
I would go for the Antec, but as much as I like to hate on CWT and their green tape, in my personal experience they make more durable PSUs. (though not by a large margin)
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