Is there a particular brand/model/type which works better than others on flights? In-ear or enclosed-ear? Size is of considerable concern - I don't want a huge pair of headphones which I have to carry round everywhere else. Audio quality isn't paramount (i.e. these will be used primarily in-flight rather than at home).

Do they all come with adaptors suitable for BA (and other airlines)? I've noticed some different plug types on different airlines, but never really paid much attention to them...