Undoubtedly Chainlink (LINK).

-Incredibly pragmatic use case
-Working product (check their website)
-Great ICO (capped to prevent mega whales)
-Whitepaper reviewed at Cornell (it actually has citations!)
-Potential partnerships in the works (a bit of rumors/speculation here)
-Under the radar because they are preparing to present a proof of concept Oct 16th

55% of my portfolio at this point in time.