Sia seems to go cheaper but we'll make it up in volume compared to storj. I like Sia little more than Storj. But the real best is MaidSafe. It's practically the new internet. It has been around for pretty much a decade. It serves more areas than just storage. The only negative I see is that Maidsafe is practically too ambitious. It's a lot of work.
The recent price changes does represent what I think about the 3 coins. But there are so many things that could happen in the short term. For the long term I'm betting MaidSafe>>Sia>Storj