How do you get to DCA National Airport?

Coming up Route 4 (or Route 5), what is your preferred option for getting to DCA Reagan National Airport? Do you go through the city (Suitland - Freeway - 14th Street Bridge) or do you prefer the roundabout way (Beltway - Wilson Bridge, Rt. 1).

Has anyone ever compared which is better / quicker?
Metro.
 
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