Siacoin has made it this far without the backing of any our worlds tech giants, that means it is directly competing with Google, Amazon, and Microsoft. Since Storjxcoin has the backing of Google then I feel it gives it the edge and shows that Google realizes that this is the future of data storage which is why they are backing them. Another advantage Storjxcoin has is that you can rent out the storage space that you dont use up to other people which is pretty interesting