I think in the first place will stand Cardano, in second EOS, and in third not yet created at the moment cryptocurrency.
May be! I think! You can see Top 3 coins in 2020 on
https://coinmarketcap.com in top #10
The top 3 coins that are pretty good for the next 2020 are coins with such an increasing development. with the developments that are present on the coin will bring the coin into a coin that is so valuable and improve its quality. such as Cardano, Litecoin, and Tron.