Emacs chooses Bazaar

Well best of luck on Bazaar.  

I don't know if Bazaar has overcome the challenges created by using file-ids.  When I was
using tla file-ids made merges where you had two separate imports of the source base into one
tree next to impossible as tla would not admit the two files with different file-ids could be
the same.

If that challenge has not been overcome I would say that bazaar has considerably less
flexibility, the git and mercurial, and that may hobble it in the years to come.