I personally love the boxes, esp price wise as they are usually only $50. + fees
as for the dry ice, they invented a system of nozells and jets that prevent that from happening (its all at the front edge of the stage, it was invented for this and the original Les Mis productions but Les Mis closed soon after installation)
I think too cost would be a factor, generally speaking west end tickets are cheaper and the theatre is smaller so you would get a better view. etc. The cheaper tickets at the Majestic up at the back are very far far away.
That being said, personally, I prefer the Broadway version because everything is just a little bit bigger and breathes better in the Majestic where as in London it can feel rather crammed in at Her Majesty's.
Physically, Phantom, but Musically for me anyways it would be Sunset and Evita. But, I do like how in his earlier works the flow is made up of song, song, song, rather than music flowing from one song to another.
Not that it was asked, but my least favourite would be Aspects of Love, his connecting music there is just so bizarre at times. Also I've never listened to Starlight or Jeves