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 made the most money from Bitcoin and Ethereum, Bitcoin because I am into a campaign that pays Bitcoin, and Ethereum because I have altcoins where I invested that I convert to Ethereum, some of the coins I made profit are coming from mining like Idena and from bounties like Oikos and YOUC.