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
with the development of coins in 2018 is able to become a benchmark for the future development of coins such as coins that are very capable of reliable future. so it will be able to make much higher profits. such as Ethereum, Bitcoin and Ripple is a profit and pledge 2020.