the same bands will play both shows. the exception is lifetime, which is the only band on this tour worth going to see. but since you're a fall out boy fan, you probably have no idea what i'm talking about.
so as far as you care, FOB, Permanent Me, and Early November are playing both the Philly and DC show.
the electric factory, however, is one of the worst clubs to see a show on the east coast. while the 9:30 club is one of the best.
your decision.