I personally feel that Cent OS is a way better choice for a server for multiple reasons. It’s a virtual clone of RedHat, which has been THE server distro since Linux was born basically. From a performance and stability standpoint, I think you’re better off. Plus, CentOS is more ubiquitous in the server realm. Plus, if I’m not mistaken… doesn’t CentOS come with sane defaults for SELinux out of the box?
Either way though… with a VPS, you’re going to be working via the command line whether you run Ubuntu, CentOS, Arch or FreeBSD. SSH is SSH regardless of what distro you use.
IF you were going to switch distros, I’d probably tell you to switch to Debian. But… if it’s already configured… there’s not much to be gained.