I don’t really have a dog in the fight because I rarely travel to home games, preferring to visit great away cities instead. When I do come to a home game, the highlight of the travel to and from on the Metro is passing RFK.
That said here is my completely inconsequential opinion and ranking of possible sites:
1. RFK
2. Oxon Farms
3. Landover
Last- any stadium in what used to be bumfuck Virginia that is now the highly populated suburbs like Dumfries, Woodbridge, etc. I would stay downtown for any trip to the city and never rent a car but even with easy Metro ingress and egress those locations wouldn’t make my toes tingle.