Pros of taller enclosures are that there is a lot more room for enrichment items -- natural material hides (cork rounds), climbing opportunities. There is more room to just get hands in there to work. More clearance for RHP (which takes up at least an inch of headroom). More thermal gradient (both horizontal and vertical).
Cons of taller enclosures are that they can be somewhat more challenging to heat, but the difference between 12" and 18" tall isn't much in this regard.
In general, a taller enclosure is going to be better for nearly any snake (exceptions might be really heavy bodied snakes such as those in the P. brongersmai complex -- short tailed pythons); 18" isn't really that tall.
I recommended a T8 initially since it is OK for a BP and importantly is a quicker ship item (and you're apparently in something of a time crunch). But checking just now it looks like they have T3, T4, T5, T8, T10, T11 and T12s ready to ship, so you have plenty of choice.
My BP (male) is in a T8 (so, 48 x 24 x 12" tall), and the height is limiting. If I had more vertical room to spare, a 24" tall would be nice to give him a little climbing space.
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