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?
My current coin is Ethereum. For me the profit that can come to me this year is in Ethereum, so all the coins I sell and the proceeds from the sale of all the coins I keep in Ethereum. For today alone, I've made a 30% profit on Ethereum and I'm still holding on to it.