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 that on the upper deck behind business on some airlines like thai..you(such as Thai Airlines,), you cannot walk around and cannot go downstairs. So you, and thus are are trapped in a tiny area. The cielingceiling is also lower.