(great question!) its pretty hard actually, although I think I would have to go for my first u2 concert in cardiff last year. It was my first concert and the seats we had sucked, and it took us ages to get there because i wanted to go to manchester instead but we couldnt get tickets.. so i was lumbered with cardiff. But it was amazing and exceeded all my expectations! Perfect venue too, the biggest stadium I've ever set foot in.
Same!