This discussion has been done a few times. To summarize:
- Belly heat tends to be more commonly available in commercial racks, thus more people tend to side in that camp.
- The proponents of back heat like the fact that you don't have to worry about temperature differences between the substrate and the floor of the enclosure with this method.
- Both can work sufficiently well in creating the temperatures needed for proper thermoregulation.
- Ultimately, it's a personal decision.
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