Maidsafe: Committed 100% to security, censorship resistance, and anonymity. Their full commitment to these concepts perhaps makes them slower to market.

Substratum: Committed to anonymity, but their security is not as strong as Maidsafe and they are not only reluctant with censorship protection, they actively encourage censorship. Their killer advantage over Maidsafe is that they will likely be first to market and they have distributed computing and web hosting already built in.