Think of it like Oceanic is the escelade and AGA is the Avalanche. Same damn thing with different price tags. They are just trying to cover all the bases.
I have the 220 on my 180 and for a cheap skimmer it works really well. I'm also not fond of the bubble trap but I saw a mod somwhere where the guy just slapped a "T" on the outlet and droped a piece of PVS to the waterline in the sump. I've not had a chance to hit the store so i haven't done it...