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 think that BTC, ETH and ADA are the coins that can bring us big profits in the short and long term. But Ripple, in my opinion, is already losing its value and may soon go down. With the problems that have started and are getting bigger, I don't think Ripple will make a some leap. Personally, I would not risk investing in XRP.