The canister must win out here becasue it has more positive displacement filtration then a Power filter so I suppose given only two choices Ehiem wins out.
Quite frankly however for the price of just one Eheim 2211, you could buy what in my opinion is a much better filter for capacity, surface area performance and better design at only half the price of an Eheim 2211. The Sunsun HW 302 for only $36.45, what a filter.:drool:
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http://cgi.ebay.com/AQUARIUM-FISH-T...045?pt=LH_DefaultDomain_0&hash=item2c53c9cc85Where do you buy one of these beasts?