I don't think anyone's mentioned, but obviously the species of snake you have is important too. If it's arboreal, the flexwatt won't do squat for you.
I agree in use what works for you, but in my T8s I use only a Pro Heat RHP with probe on cool side (I had it on hot side but it seemed to create a lot of temp fluctuation). My room temp is in upper 60s.
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