I would have to say....from personal experiance..........
For ease of operation...maintenance overall performance and cost, the magnum canister filters rank high with me.
I still have one that is many, many years old and it works like a charm. Although I do not use it as a continuous filter, but as a quick clean up (with diatom) it is one of the best I have used.
I most times do not even use diatom powder, just the pleated cartridge with a sleeve over it.
For hang on backs....I would say aquaclears, but then I have not had the opportunity to use any of the biowheel filters. They were not around during my days of outside filtration usage and since I use only box and sponge filters now doubt I would have the chance.
JMO...
CM