What makes this coin supperior to storj ?
This has been addressed already in this thread.
Dev technical answer:
We already have Storj. How is Sia different from it?
Sia uses a substantially different technology stack. From what I understand of Storj, storage verification happens through hosts checking on each other. Storj does not have good protection against deduplication, Sybil attacks, and has a novel and not academically verified method of consensus. Sia does use an academically verified method of consensus, has strong deduplication defense, and strong Sybil defense.
Storj has been changing rapidly, some of my criticisms may no longer apply.
My non technical answer:
Nobody knows and nobody can say which will be better or if either will even be completed. All anyone can do is try their best
in their belief as to how a storage coin can work best. I decided long ago not to bother even following Storj cuz I liked Sia's
2 devs and what they're trying to do. If I'm right I'm rich, if I'm wrong oh well then Storj coin holders will be. Que sera sera.
By the way, an obvious difference is Sia has a launch date around the corner.