Tubs hold humidity better but are a touch more difficult to get a good gradient established they tend to heat up the whole thing and the ambient temps can gain a bit. The biggest complaint for me with the tub is I want to see my enclosure. Tubs are translucent and I need to disturb the animal to check anything I can't just peek in and keep the disruption as small as I can.

Tanks simply look better. This might be a solution for you I have set up mine and with out misting or messing with water things it has held 60% on the nose for 3 weeks now. Temps are perfect and it still looks good.

http://ball-pythons.net/forums/showt...arium-Solution