There is a lot of conflicting information and you just have to decide who's opinion you trust more, people who have kept large numbers of reptiles for several decades and had success with them, or some people on the internet who are worried about them being "happy" but either don't own one or only have kept one or two for a couple years.
I've tried it both ways. I have juveniles and adults kept both ways now. It depends on the individual snake, but 95% of the time, smaller is better. You take the time to get to know your individual snake and how they act in a small enclosure first, 15qt tub is perfect for most 2020 BP's, but if you get a late 2020 100-150g I'd go even smaller than that and do a 6qt very temporarily. Height is the last place I would add size if making a custom enclosure. If they really do want more room, length is a lot more important and less scary to them. I would stick with 6" or less in height till they are a lot bigger or you know for sure you have a particularly confident one.
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