The Fios Mobile app allows you to stream a number of live TV channels (not all), as well as access some on-demand libraries (Starz/Encore) if you subscribe to them. And you must be at home to use these features. There aren't any download options at this point.
The Stream can stream live TV of any channel you receive (it will initiate a recording on a Premiere and stream it to you) as well as stream your recordings. You must be at home for the streaming to work. You can also download recordings to your device and take them on the road with you if you wish (except for HBO/Cinemax which are copy-protected on Fios). The Stream only works with the Premieres in your setup.
Overall Stream has more flexibility. The Fios app is decent for some casual TV viewing though.
Last edited by BigJimOutlaw; 07-25-2013 at 01:46 AM.