Power Supplys

which of these SUPPLYS power is the best?
im looking at two PSU for my computer with the same amount of power, but one of them is $ 10 more. Why is it better? http://www.newegg.com/Product/Product.aspx?Item=N82E16817182072&cm_re=rosewill_xtreme_850w-_-17-182-072-_-Product http://www.newegg.com/Product/ Product.aspx? Item = N82E16817182070 & cm_re = rosewill_xtreme_850w-_-17-182-070-_-product
the lesser value than that which has two fans. 1 on top and 1 on the front. 2 fans is the best way to do that. there is probably less expencive due to the transaction parties. if u like this plz make better answer
