I have the Japanese version of the marineland and a fluval 405 and I feel that the fluval is definitely a more powerful filter and can run a much higher turnover rate even when I go twice as long between cleaning. My only complaint about it is that the seal for the quick disconnect has worn out(I got the filter used over 2.5yrs ago) and even with replacing all the gaskets and keeping them greased I get that slight drip when the power is turned off. This is easily remedied though by shutting the valve when I manually turn off the power, and have a syphon break drilled on the intake hose so it can't drain out more than a couple of gallons in a catastrophic failure. The marineland is also very well build, but I have cracked all three baskets trying to remove them because of the tight fit, and I think the interior design of the fluval lends to a much better performing filter.