UTH and CHE are different types of heaters and behave differently. UTH are radiant heaters and heat objects not air. CHE tend to be convection heaters and effect air more than objects. The heater should be selected based on the individual enclosure needs, if you have ambient issues (too low) a CHE is one possible solution, a radiant heater is not a good one. If you need to heat the surface and the air temp is correct a UTH will provide a hot spot without have large impacts on the air temps.

there are a lot of heaters out there they almost always are radiant and there are a few convection

Radient
RHP
heat tape
heat cable
carbon sheet heaters (flex watt, commercial uth)

Convection
CHE
Most lamps (other than heat lamps)
tube heaters (golden rod)

Convection heaters change the air temp and therefore change the saturation point and in turn the RH %

If you have given a 100$ deposit it is 100% of a 100$ snake if you change the snake to a 1000$ snake it is only 10% this is the exact same. Either way it is 100$. A given snake will need a given amount of water in the air to shed how close that is to the saturation point of the air is immaterial.