If you have a choice to fly in and out of an airport in the DC area, Id say Reagan National.
First of it is gorgeous. I remember when I was younger and there was only terminal A. Its this old, small building that was not fun at all. However terminal B is soo nice. I love walking through the hallway of windows and getting excited by all the planes that are parked outside.
Second reason to fly out of Reagan, the awesome views at take off and landing. Theres no other way to get an ariel view of the DC area so you might as well as take advantage of the awesomely located airport.
Last reason to fly out of Reagan National- better food options. ‘Nuff said.