If you have a spare microSD card,then set it up as Openelec (which is a like a wrapper for Kodi 14.2).
If you don't have a spare microSD card, get one and proceed as above
I'm not sure what is on the Noobs card, maybe it gives you a choice of OS to install.
I tried Raspbmc (now osmc?) and Openelec on a Pi B and B+, couldn't really see much difference between them. I use Openelec because (insert reason here).
It's just a matter of tinkering. You can't break the Pi, and you will probably end up with a bunch of microSD cards with different flavours of OS on in the end. And probably a whole house full of Pi projects!