UTH Side or bottom?

ok the winner by unanymous vote!!! Bottom Heat!!!.. I have swapped my side mounted uth heaters from side to bottom heat .. and I just got my helix thermostat today so they are all cozy @ 92 during the day and I'll drop to 85 tonight!

Back heat really doesn't make sense to use. It only heats the back side somewhat and like someone already pointed out, heat rises! So while the heat may the very back of the tub, it will do a very poor job at keeping a good gradient. Plus, belly heat is better for digestion as someone also pointed out. Basically, when the snake wants to warm up, the belly heat is a much more efficient option than back heat.

Both are fine. Depends on the system like waltah said. Though, I do believe that side heat takes a little longer for the snake to digest its meal.