Hard to so which coins will be the top 3 in 2020. But I think the top coin will be Bitcoin (it will be top coin until 2100!!! 
), the second coin will be Ethereum and the third coin will be EOS!
Agree with this idea as this is the 3 coin that has the largest daily trading volume at this time. I am confident that if the market shows signs of improvement, these 3 coins will be the first 3 coins to increase. I like the EOS platform and ETH because these are two different platforms and are competing directly to win the second place. ), the second coin will be Ethereum and the third coin will be EOS!