That one depends on some many things. What do you need or expect?
Do you want a reliably filtration for several years? (perhaps EHEIM)
Do you need a low budget filter?
Do you need an especially silent filter? (perhaps EHEIM)
Does is have to be able to take care of messy water by a big Pygocentrus shoal? (only big EHEIM canister like Pro III)
Is it only a great water circulation power you are after? (perhaps Fluval FX5)
Harry
