For me it's definitely ADA and TRX. The guys do a lot this year. Maybe in 2020 we'll see them in top.
No I think it is the only bitcoin o invest in 2019 because it is rising in price with the passage of time, I can see the market value of bitcoin is getting higher BITCOIN is the mother of all other altcoins and it has more value than other altcoins, till 2020 I think price of bitcoin will gain highest value and it will improve even more than before.