LINK is the altcoin to buy
It doesn't matter whether ETH, EOS, TRX, ADA, etc. become the main smart contract platform
LINK will connect all of them to offchain data
Keep reading a lot about this Chainlink but I still do not think it will take off. A great idea in all aspects but even a Bitocin-Ethereum bridge which was proposed has not taken off, I really do not see the point of adding other platforms that are not really experiencing much utility.