Lots of yanks commenting who have never been in an A380, as it's only used in euro, Mid East and Asian airlines. The A380 is so much more comfortable than any 747 I've been on. If you do long haul on an A380 in any class you won't go back...
You seem to be under the impression that European, Middle Eastern, and Asian airlines don't fly to the United States.
I've been on the A380 at least a dozen times on the LAX-NRT route. It also flies into ATL, JFK, SFO, IAD, BOS, MIA, and IAH.
The best part of the experience is the relative calm of the small economy class on the upper deck. To be honest, other than that, I don't particularly prefer it over anything else. If I was pressed I guess I'd say I prefer the 787. Mostly I prefer whatever gets me to my destination without a layover (which, thankfully, is usually available from SFO).
The worst part is the crush of people trying to board the damn plane, spilling out all over the entire terminal.