I like can. filters but for a much different reason. They seem to have less room for water to creap around the filter midia (I have never actualy tested this). I am running a hehind the tank on my 45 right now why I make a canaster filter for my tank. I over filter alot though. I will be running a scimmer (yes freshwater can be skimmed), a diy canaster macanical, a diy canaster chemical, a diy wet/dry w/ sump. It is up to your personal tastes I don't know of any (Out side of the manufactures) studdies on which is better. Just becouse I like Cans and john doe likes Cans does not mean that you would like a can. They require a little more work to keep them clean and require a whole lot more plumbing.
Good luck whatever you use.
Good luck whatever you use.