I think the best way would be to take a look for yourself and make an informed decision based on what you see. Neither of them take very long to install on a WAMP/XAMP/MAMP server (I tend to play around with Uniform Server if I’m doing that kind of thing), and just take a look.
Your biggest issue might be re-creating your current site design in Joomla, though technically, it should be more than capable of handling your needs (as could a number of others).