undergravel filter vs overhang filter on a 75g tank?

depends on how deep and how long it is.... my tank has an undergravel filter.... my tank is a 18inch deep 35 gallon tank i personally like undergravel.... and u dont have to clean gravel as well because of the bacteria ( so ive been told....) uhm email me if u want....
 
Undergravel moves everything under the substrate, while overhang sucks up anything by intake tube.

I would use both for optimum cleaning.
 
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