I spend most of my life flying longhaul and normally in buisness class, along with a large number of my collegues. To be fair I don't care what a/c I'm on.
My order of requiurements are:
1. Flight times / routing (I want the last leg home to be the long one)
2. Service
3. Anything else
If you take me and my collegues as the type of passenger airlines want (fairly high yield).
1. The last leg home will not be supported by the A380 as I live at an airport which does not have any airlines who have bought the A380 and even if they did it wouldn't support these routes. The last think I want is to sit at FRA for 4 hours after a longhaul flight for only a 2hr flight home.
2. BA service rocks! By far the best buisness class. So even if I can choose which aircraft type I'll be flying on BA no matter what it is.