Did a lot on research on Sia, StorJ and Maidsafe - Sia is my favourite by far.

• Great, transparent team with good roadmap (Seriously, there is no other project-lead with such great community interaction)
• Nameworthy investors backing the project (Li Xiaolai just gave them a 400k grant to expand their team https://sia.tech/2017grant/)
• Mineable, no ICO
• Upcoming ASICs to strengthen network
• Rising development on top of the Sia network (eg. MineBox with HP cooperation)

In my opinion definitely a Top 10 coin in 2018 - I can only recommend to check out their reddit /r/siacoin.