For me, that had to be Ripple. I traded for 100%+ thrice and still holding a position at $0.40.
My next coins are:
1) Ripple
2) ADA
3) Bitcoin
4) Ethereum
What's yours?
The coins that I currently have are Tron and Stellar because I am sure that in the future these two coins will be at the top following Bitcoin ethereum and others. and previously I have sold Dogecoin and Dogecoin has given me some money due to the high price. I hope the two coins that I have will come back to follow it.