From DistroKid.com: "We'll put your music on iTunes, Spotify, Google Play, and Amazon."
Different model, no?
DistroKid helps musicians get their music in the mainstream stores. Bandcamp is its own store.
I think they're serving different ends.
Did I mention that I love bandcamp?
Artists set their own prices and many are below the $0.99 price point.
A lot of albums are "name your price" and you can't beat that.
Also the community feature of bandcamp will be harder to beat.