I like HOB's for a nice lower maintenance lightly stocked low tech no co2 tank. I love that they take like 2 seconds to clean and are WAY cheaper compared to canisters. The canisters have way more room for media... but I find I don't rinse them out nearly as often as I probably should, cause it's a bit of a pita. I sometimes have trouble getting the top off, and almost always get a bunch of water on the floor. On my 55 cichlid tank I have an aquaclear hob on one end, and a fluval 404 on the other. On my 65, I just have a fluval 305, as the design of the tank doesn't allow for a hob. If it did, I probably would have one on there.