I installed Webmin 1.580 originally on my Ubuntu Server 12.04. I find the following features useful..
1) File Manager : Easier than using the cmd prompt as you can see all files and edit, delete, create accordingly.
2) Accessing Server Settings: Such as ProFTPD, SSH, Samba File Server.
3) Setting up User Accounts and Passwords.
Can get lost in a lot of the menus.
I would recommend Redhat with Cpanel over Ubuntu/Webmin. If you want something really basic then this will work.