Glass tanks work fine. had my bp in one until I got the Animal plastics
He did great, all 3 sheds were prefect. Like posted you have to do a few minor modifications but no big deal.
Easy to clean and at least you can see your animal which to me is one of the reasons I have it, is to be able to observe it.
If you buy a rubbermaid you have to do modifications so it is really 6 to 1 or half a dozen the other.
Which ever YOU like and want.
To answer your question I would go for wider than higher.