It really will just come down to the weather in your area. If you live in a dry climate, then any sort of lamp will have you fighting to keep the humidity up. The space heater will help heat the whole room.
I would start with one UTH and then if you still are having trouble with the cool side, get a second UTH.
It is rather difficult to remove a stuck UTH but there is a sticky on this site about how to remove one. Try the search function.
Just remember, whichever heating method you go with must be controlled with a thermostat to prevent cooking your snake.
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