Tubs work fine tanks also work well no problems if set up efficiently. I have a rack and open toped tank modified tank and custom enclosures. The differences don't really change things much tubs take a more careful balance to heat properly especially to avoid huge temp spikes. That can be seen with on off type t-stats, I would never recommend a on/off t-stat with a direct heated tub (no buffer from the heat to tub.) that makes the tub with t-stat the same price as a tank with t-stat as tanks have a lot more mass than a tub as heating spikes are moderated by the glass. Enclosures cost more (vision, boaphile ect.) but look better in my opinion than either.

The end of the day the difference is made by the keeper not the enclosure it is a silly argument it is like saying a ford makes you a better driver than a dodge. A diligent keeper with the right information can balance the perfect captive enclosure.

My tank is absolutely no problem with heat or humidity, It is currently at 58% (tested accurate hygrometer) and I DO NOT MIST, and don't wet the substrate either. Just a large water bowl and balanced ventilation.

One point that is often over looked is that the ambient temps, the air temps, are very important! Ground surface is too but air temps are just as important. They should be 80-85ºF The logic is easy the lung (the longer one) passes beside the heart liver and all the major arteries, if the air is cool the blood is cool and no amount of warm skin will off set the air temp. That is one problem of tubs they often do not hold ambient temps well and heating a whole room for a small tub is kinda over kill.