Oh Yeah, it's my first time to properly have a Linux OS, so I want the easiest to use version.
I have used Red Hat Linux at work, but only poking around to make the basics work, I am no expert!
You should go for Ubuntu, as it has a nice UI and is widely used. when it comes to Linux, each user have his own preferences, but in the end what ever you want to use you will have a linux system with different features.
Personally i like Ubuntu because it has a nice GUI, the unity bar is just useless to me, but if you are a MAC user, then it should be handy.
Beside that, no difference.