For a comparable gallon wise with mrc I would need to run a reeflo baracuda pump to run it the mrc skimmers are not very efficient in my eyes. I love my swc 200 that I have on my reef now. I really don't think I'll need to skim heavily with a 150 gallon 4 camber refugium with mangroves colurpa and whatever other two macros I choose to do.
Size is not a issue the will all fit. I have been kinda leaning to the swcs2 it is rated to 700 gallons the swc 300 is only rated for 400 gallons.