Over the years I have had various trees in various sizes:
AE split toe - medium and large
AE full toe/JosABank full toe (same thing) - medium and large
Alden and BB (which are both split-toe and are substantially similar) - medium and large
So now, unless I have lasted shoe trees for some of my English shoes, I use almost exclusively:
AE full toe/JosABank full toe - medium
Alden and BB - large
All of my shoes would fall within the following US sizes: 9, 9.5, or 10.
I am one who generally prefers my trees to fill the entire toe box. Some don't really care about that, which is fine with me.
This is very helpful. Fully answers my question.
I will order large.