For LH A380, go for upper deck economy, they are the best. Small Econ Cabin, 242layout with 6rows, it is quiet and you get your meals serviced quickly. Window seats also a small storage room next to the wall. And upper deck is less noisy with the engine sound too.
Beware on the upper deck behind business on some airlines like thai..you cannot walk around and cannot go downstairs. So you are trapped in a tiny area. The cieling is also lower.
