I think Siacoin is a great coin, but I don't think it's going to last. I think Filecoin is going to win the battle for the decentralized storage market.
What are filecoin's attributes? That is ETH based right? or do they have their own blockchain. I think SIA is a really solid protocol ontop of which other services can build themselves. It's already got most of the infrastructure, so anyone wanting to use decentralized storage can already do it with SIA. If it proves efficient it think it will do well for a long time.