I had to vote for the XP since it has really served me well so far; only 3 months :lmao: Seriously, I am pretty impressed considering what I paid for it as its silent and seems to pull crazy amounts of gunk out of my tank. The only complaints I have really seen on the XP is that the splashing can be loud but thats only if you run the skimmer extremely shallow. I know; water covering the water exhaust creates back pressure but so does the gate valves, so whats the difference?! So I run mine at the water line and problem is solved.
Now, what steered me away from the SWC was 1 complaint in particular of the askoll drawing almost double the watts from the wall. Hey everyone has a bum pump every once and a while, it happens, but I didnt want to risk it.
Either skimmer is probably going to run great; let us know which you choose, I still think both are great. I might try the SWC160 for my shallow 70g.