When you say "easier to configure for mobile devices", do you mean the front-end or back-end?
Also, when you say "for somebody with a Wordpress background", are you a developer? or just an average user who has used some basic WordPress tools.
Sorry, I am not being snarky or anything, I think it will be easier to answer if you give a little more information.
For a developer, it is not too big of a leap. I am not so sure about Joomla being easier to configure for mobile devices.