Re: How to install samba 4 as an active directory domain controller
just answerd to your other post.
4.0.3 also has FSMO and GC management etc from Samba-tool.
That's not a version holy war (although I like the term) but by experience up to date products still will show your better how things work (more functions, corrected bugs, etc.. )
for instance samba-tool got a lot of improvement since 4.0.3 (process subcommand appeared in 4.0.10, domain join MEMBER also is easier than net ads etc...)
One step further might be one step too far...