I think Chainlink is the fastest-growing coin of this year. After the google partnership with chainlink hype, LINK coin got overwhelmed support from investors. This coin's price, rank in CMC everything has grown very well. Now, the LINK coin is in everyone's favorite list.
i think 2019 is the year of Binance Coin because if you see the chart in CMC you will know that the price of bnb increase almost 5x from 6$ to 36$
Chainlink surprised many people, this is a comparison of the price movements of Chainlink and Binance coin
sorce: https://coinmarketcap.com/currencies/chainlink/ source: https://coinmarketcap.com/currencies/binance-coin/
if we pay attention from this comparison, we will get that Chainlink is the fastest growing coin in the past 1 year (52 week).
Both tokens have had a great year for investors but I think what he is asking for is the next BNB and Link tokens. This year we have seen low turn out in ICO/IEO and most of the project still dominating the space are still the 2018 and above tokens, the one project I am looking at is Matic and people need to watch out for it