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Agreed, but if you are looking at a comparison of those two as part of a filtration system, I prefer the ACs, as they allow for more media customisation, and have that 500gph flow rate.
You can mix and match the media in the basket almost infinitely....for instance, I run mine with big sponges as well as bag of whatever bio-media I like...and the ACs will hold a lot of media, whereas the others are all designed for a fairly infexible cartridge.