GNR concerts start in a flurry, 4 or 5 songs in quick succession. After that there are longer pauses between songs, I guess the roadies would have time enough to swap certain things over and adjust positions.

The more I think about it, the more I think they will just use the drums prefered for CD for the whole show. After all, that clip of Sweet Child had the CD sounding drums.

I like rock and I like melodic, I'll just have to get them all.

Aye, I mean both playing on the same night.

I can understand Axls dilema, Brains probably my favourite drummer ever but when I seen them live Frank was a standout performer to me. He had an Adler like enthusiasm and charm, and was very interactive with the audience. He fucking loved being up there and he showed it. How do you let one of these people down and say, no I want this guy over you.

I'm not as confident it was Brain now, those drums have a distinctive Chinese Democracy sound, thats what made me think Brain. I would say Brain over Frank, Franks sound has a deeper resonance than Brains kinda solid snap. I dunno squat about drumming though, but I've sensitive hearing.
I've said since I first heard it, that Frank takes over drumming on IRS during the verse "feeling like I've done way more than wrong" , then it goes back to Brain at the chorus until the end of the song. I actually asked Frank this at mygnr, hopefully he will confirm or deny.

Surely both drummers have a prefered set up, how will that work on tour?

Thats just stating a fact.