My choices are ETH, XRP and TRON.
They are always top notch coins. We witness XRP and TRON had a great Q3 this year. They had a lot of achievements and events going on in 2018.
For 2019, I think is the year of masternodes and privacy coin. I can't tell which ones will go to the top but I would love to see a privacy coin like PRiVCY.
XRP always bounce back and now it's bouncing hard because it will almost reach 100% in just less than a month.
I love to invest in high volume coins especially when it's falling because the result would be good as long as you stay patient, just like XRP.
TRON and ETH will likely to rise as well, but it's not their time yet.