Obviously tastes differ, but in all seriousness, none of the above.

If I had to pick one of the three, I would pick NoMa easily. I lived there for almost two years and it was fine. It isn't my favorite neighborhood in DC, but it's passable. Metro access is convenient. I've never had any problems there personally, but I did see a guy get mugged once outside my apartment building one time at night.

Personally, I hate new apartment buildings (they have so many problems and aren't as sturdy/well constructed as older buildings) and I liked that NoMa has a mix of old row houses and newer buildings.