I love the 747
Since I was little, I have always just loved the look of the 747. I have not ever flown on a 777.
The last time I flew to India, I flew in Air India's business class (got a good deal) and was in the upper deck of a 747. It was an old plane with nowhere near the ameinities in current business class, but I loved being upstairs.
My brother enjoyed upstairs economy on BA when he took it a few years back.
My trip to South Africa last summer was on an SAA A340. I found the seats rather uncomfortable and felt like the pitch was quite low.
I am looking forward to seeing the 787. I do not think I would like to be on an A380, though. I guess I have a bit of a Boeing bias! I have not been as fortunate as some of you to fly in premium classes much, but perhaps in the future I will.