When it comes to Cone skimmers, its all about the pump. From the info, I've seen of the SWC, its an Atman pump which is the same pump as the SCA. The SWC body is superior, but the performance is probably going to the same.
Atman was the breakthrough econo skimmer pump 8-10 years ago. But they haven't changed or improved.
My suggestion for your size; Bubble Magus C7, Curve 5 or 7, Sea Side CS7, Your Choice DC13, Aqua Excel 301C or 401C
I've physically assembled and tested almost all of those models through my company.