Fred, if you have a number of sources going in to the TV then you might just want to have the one audio connection between TV and Uniti, all devices having their audio routed through the TV and then on to the Uniti.
One thing though that you need to ensure is that the digital signal to the Uniti is only 2 channel PCM and not multichannel Bitstream (your TV should have a setting in the setup menu for this). Only other issue with a digital connection can be latency. Better TVs now have lip sync controls, but it yours doesn't then you may find that an analogue connection has lower latency, and hence better lip sync. It varies from model to model and brand to brand, so something you just have to try out for yourself and see (and hear).