General Admission floor or upper level for tickets to U2 at Giants Stadium?

Me and a friend have been dying to see U2 and are so excited they are coming to the Meadowlands. My question: because both the floor and 300 level at the stadium are priced at 55 dollars, which would you recemmend we buy tickets for. I was thinking the upper level, because on the floor you could be very far back, yet the floor can be crazy, so I dont know. Can anyone with floor seats experience, especially at Giants Stadium, explain to me which you would prefer for the same price. Also, if we did buy floor seats, how early would we have to get there to be somewhat close? Thanks very much