I've always thought Gaga sounded better live when performing LoveGame and Paparazzi, and about the same when performing Just Dance. Poker Face also sounds excellent live, I just prefer the studio version more.
here, she sounds better then the studio version IMO, on her latest tour most of the videos I saw she sounded better as well, in big events she always gets nervous and they don't do her justice, hope she can deliver ASAP so she can shut some mouthes