Bloody Mary could be hit-or-miss. It could be really well received, or it could completely flop. I agree that her performances would be amazing, though
Scheiße is the best choice in my opinion. Hair is my 2nd choice. Both commercially viable songs. The only reason why I prefer Scheiße is because it would smash in clubs and is more immediately catchy; I think the general public is really hoping for the fierce, upbeat Gaga that defined her most successful singles/videos.
I'm in class right now doing ice breakers and we did one where one person had to guess what was on the board without looking and one topic was "Did Gaga's BTW copy Madonna's Express Yourself"? When I saw that on the power point...