Hi, first of all, sorry if I've posted in the wrong forum. Tried to guess the best place to post this and I thought this might be it.

I'm flying from LA (either LAX or BUR) and going to Washington DC in May (any airport, but DCA is much preferred on the way back). I have United, US Air, and American miles saved up and wanted to treat myself to a comfortable flight. Any thoughts on which airline has the best first class experience on this route? Thanks for your time!