heat is heat, doesn't matter. Rack design and the room it is kept is what you need to look at.
Personally I switched all my racks to back heat but I keep my animals in their own room which is warmer than the rest of the house and also keep them in enclosed racks built from 3/4 melamine. So I got about as much heat retention as it gets. If your rack is an open design in a room temp room, back heat probably won't heat the tub enough. I like back heat better as I feel it is easier to make consistent across the rack not having to also travel through substrate. Also the tub just slide up to it and not over it. However Belly heat allows you to use any width heat tape you like which may be necessary if your room is cooler. and also sandwiches the heat between the tub and the shelf which is almost necessary in an open rack design.
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