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
top 3 Altcoin for 2020 I highly recommend to use Ethereum, Cardano, and Waves. these three points I have noticed and have an ever-increasing development. so it is very able to rely on these three coins as a coin in the future and generate much greater profits.