[Samba] Choosing a samba version for DC use

[Brian Candler]

Do people have any recommendations on which Samba version to choose for 
production use, as a domain controller and authentication database for 
802.1x only? (i.e. no file sharing)

I note that:

* CentOS 7 comes with samba 4.2.10 - labelled as "do not use" on 
https://www.samba.org/samba/history/ !!

* Ubuntu 16.04 comes with samba 4.3.11  (although 4.3.12 exists)

The Ubuntu/4.3.11 option would be my default choice - but are there any 
compelling reasons for going with 4.4.x or 4.5.x from the start? 
Presumably that would require compiling Samba from source?

Thanks,

Brian.