I was just in the new B SkyClub Sunday for the first time. They did a great job. I love the high ceiling.
Here are my votes:
Most elbow room: B
Food: E
Showers: F
Quiet: T
I'm normally heading back to DCA which is always out of T so most of my time I spent in T.
I like the SkyDeck, but I find the bar area cramped in F.