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?
I only believe in ethereum because ethereum has given me huge profits some time ago and until now ethereum still continues to give me big and fast profits. i like ethereum because ethereum has high volume in all markets and ethereum moves very fast in every exchange market. and i use ethereum as short term trade.