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HOBs require a more hefty GPH due to their little amount of media, they dont have near the colonization ability as a canister thus they must push alot more water to sort of compensate for it. Canisters operate on a slower frame due to having more media they give your water more contact time with it. Most filter companies as we all know tend to horribly over rate their filters ability. With that said depending on your stock which model I would suggest. If you plan on smaller fish and a lighter bioload get the model up to your tank size, and if you plan to have a heavier stock go for the one over your tank size. With that said I would also pair the canister with a moderate sized HOB such as an Emp280, Penguin 350, or AC70(something in the 300GPH range) to add some extra filtration and current at the opposite end of the canister.
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