My money is on STORJ breaking through.

Need enterprise clients to make this technology and economic system viable. STORJ is the only project with funding or team.

Don't get too caught up on 'decentralized' for application based stuff. Siacoin is too decentralized IMO.

I am holding Siacoin. Also look at Filecoin.

STORJ is the most 'live' I think. They even have a corporate client.