DATAcoin from Streamr team:

-clear vision: a decentralized market for (high-freq) data providers and consumers
-relatively low market cap compared to coins with similar utility (Sia, Golem)
-strong team with experience from financial markets and competetive high-freq trading environment and advisors from Golem and OmiseGo
-part of the project and features are already up and running and in use by customers