it's not really about the mic, but the patern. omnis can be very boomy in those kind of venues. when in the middle of the arena, the sound will bounce of the 4 walls and if you're farther than 17 meters (~56ft) from the walls, you'll most likely suffer echo and not reverberation. but it all depends on where you're at. (i've never seen the garden)
fwiw, i wear my AT943's 100% of the time in large venues.