Is the major difference noise and more media that people go with canister filters? I'm undecided about future filters I may look at. Presently I have HOB on all my tanks. None are over stocked. My chemistry on all tanks 0,0,and nitrates running 10-20. Weekly fifty percent water changes. Noise with my HOB's is not an issue for me. So, there seems a big difference in cost and looking for arguments for spending a lot more for canisters vs sticking with HOB filters. Don't want argument just objective analysis please.