I am not going to go off here, or say one 'side' is "more right" than another. What I AM going to say is this:

Every snake is different.

New keepers coming on for advice should be given the simplest and proven info. However, that does not always work for every animal out there. Then, because of the adamant way tubs are pushed, they believe they did something wrong, when in fact they may just have a snake that "defies the norm". The best thing to do is try out the proven methods for your animal and see what works best FOR THEM. After all, keeping these wonderful animals should focus on their comfort before ours.

If you want an example, then take my little girl Nagini. She is currently around 9 months old and a joy to own. I started her out in a well insulated and 'full' 20L tank and she was great! She never refused a meal, shed well (once I got the humidity right), and when she explored her cage it was always a nice calm cruise.
Well, around January I wanted to put her in a nice display cage but it wouldn't stabilize as far as temps or humidity. So, because I had already disinfected her 20L and put my ghost corn in there, I had to put Nagini in a tub for the winter. She hates the thing! She refused meals for a while and hardly cruises at night anymore.
Most people here say tubs are much better, but I have to disagree. In my tanks I get a wonderful gradient for temps...in tubs I have what amounts to two temp spots over two UTHs with no real spread. I WILL say, however, that the humidity stays right where it should in a tub...once you get it stable.

Ok, sorry for the rant, but this topic kind of gets my goat as it were. The bottom line is that every snake is different and the keeper should find out what works best for their snakes that is within their own means. And, of course, any changes that are made should be done slowly and gradually.