Which framework to use

Which framework to use

I'm going to be starting a customer portal project soon and wanted to get opinions on whether or not to use jquery and jquery ui or start with jquery mobile. Mobile users should have access so I was going to use that but what if any support does jquery ui have for mobile? I do like most of the functionality from UI and would rather use it, but if mobile isn't really supported well I can't start down that road. Any help would be greatly appreciated!