The Marineland filter has bio-wheels which serve to provide surface area for beneficial bacteria.
If you use a Hagen Aquaclear, I believe they come with a bag of ceramic media or similar - I'd swap that out for Matrix.
If using a biowheel filter, never wash or replace the biowheels, or it will destroy the bacterial colony. The ONLY time a biowheel should be replaced, is if it's broken. Over time, they will discolor and maybe even turn at a slightly sporadic rate. That is normal. Some areas of the wheel will have more bacteria than others, and it changes the weight of the wheel in spots.
The Marineland filters are very easy to maintain. Rinse the pads weekly, replace monthly (or sooner if they get really gnarly. It's good to take it off periodically and rinse out the body of the filter for any sludge that may accumulate. Easy to remove the intake tube assembly and impeller cover to clean that, and check to make sure the spray bars that spray water onto the biowheels don't get clogged (bent paper clip or a toothpick works if you do get some flotsam stuck in them). By and large they are very low maintenance and very reliable.
Jenn