From my experience (2 snakes, 2 tubs, and the room does NOT keep a constant temp), tubs are MUCH easier to maintain consistent temps and humidity. If the humidity is a little low, use a bigger (surface area, not deeper) water dish, move it towards the warm side, and cover a couple holes until you achieve the optimal humidity. If you cover 1/3 of the tub with the under tank heat, you can use aluminum tape or foil on the bottom (outside) of the tub which will dissipate the heat throughout the tub and will keep your cool side temps where they need to be... I can keep my bps in a room that stays approx 70 degrees and maintain the temps I need... Humidity is a breeze in the tub though...