If it is a heavily planted tank the plants would do most of the filtration, and heavily filtration should not be neccesary.
I have used both canisters and hobs on different tanks, personally i dont like canisters, i find them more difficult to clean and they need some more mechanical maintanence to keep them from leaking. I have had a experience with a canister that started leaking when i was not home, and i can tell you, that was not fun
Personally i like in tank filters, it is possible to make a great internal filter (mutch better than bought ones) and attached it to a powerhead. In planted tanks i find them easy to hide and there is no equipment showing out of the tank, and the filter leak threat is eliminated, one more leak factor gone.
I like DIY, and i personally think the aquarium equipment market causes us to belive it is nessesary to by expensive equipment, not only in the filter departement.