Holochain project is something as unique as Bitcoin. Holochain is a part of the bigger project MetaCurrency that is going to change the entire financial system.
Holochain has a user-centric architecture which makes this system much lighter than the blockchain which is associated with data (so every blockchain user has to maintain the entire data processed on a certain blockchain).
We are yet, to fully see if Holochain proves its efficiency, but the same can be said of most of crypto projects.