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.
There are so many coins you can make money in. You could target Bitcoin, Ethereum and maybe BincnceCoin which are very prone towards gaining value in the bull market these days. You could invest some good capital in BinanceCoins which is available at low cost and you could own many of them which could be instrumental in imparting good value to your portfolio.