I can't comment on the others, but I can say the DCA lounge is good. It's compact, but also close to the gates with about a 2 minute walk from lounge to each gate. The staff were incredibly helpful to the PAX that I saw.
On a separate note, if you haven't been to DC, the journey from DCA to central downtown took 12 minutes in a cab when I was there a couple of weeks ago on a Saturday afternoon. Great city and I would recommend a visit for a short stop.