Keep in mind it's not just a safety issue - Dupont Circle is also a really fun neighborhood to live in just in general. I lived there for years and loved the safety, the easy walk to lots of other neighborhoods I hung out in like Logan and Shaw, and just the overall vibes. NoMa is a little less connected in my opinion to the rest of places you might want to go to, so you might want to consider that along with overall safety, which I cannot comment on as I live in an Old Town bubble now.