For me it's definitely ADA and TRX. The guys do a lot this year. Maybe in 2020 we'll see them in top.
if I may judge the ADA and TRX both coins are good enough to invest because they are in the top ten altcoins. but I did not invest in both coins because of lack of interest. coin coins are currently experiencing a good change, so that's your choice and your belief, I can only say good luck with your chosen coin.