Do I need the main distribution or the main branch?

[Kevin P. Fleming]

I'm getting ready to install Samba on a Solaris 2.5.1 box here to make
some directories on that machine accessible to our PC users. The PC's
are all running NT 4.0 Workstation, in a single domain. The new Samba
machine will not be a PDC or a BDC, but will need to act as a member
server for transparent authentication purposes.

Given this scenario, is there anything in the current main branch code
that would be a compelling reason to use it instead of the current main
distribution code?