How to get the minimun branch distance tree?

Question

[Destineador]

Hello and thanks in advance for any help received.

I'm just starting to do daily phylogenetics tasks and I find myself in doubt with one in particular.

I have several files containing several different trees constructed from the same MSA and I am tasked with 'getting the tree with the least branch distance' and then some more tasks with them.

How do I score each tree to then be able to compare them and select the one with 'least branch distance'? I have thought of just adding up branch distances and then dividing by the number of addends but that seems too simplistic to be the actual way to do it.

Thank you for your help, don´t doubt to link any resource where I can find the answer for me to read.