The Cougars are primo, mine have been running 3+ years and no problems (I have used 12 in different builds). The Corsairs seem to be modeled after the Cougar, and if they are clones of the Cougars then they too will be good. I'd get the cheaper of the two. I note that the Cougars give a couple of CFM more than the Corsairs and are quieter as well. So I would give Cougar the edge.