Have the X11.
Now this is a real can of worms, prepare for a long debate.
I went for the X-11 because they were incredibly light, and of low profile physically.
But, I doubt they have the best ANR on the market...I understand BoseX is the leader in that regard.
My ears used to ring after flying with my old 13.4s, they don't with the X11. So they do it for me.
But, I think they are overpriced, and the recent price drops at Transair reflect that.