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?
etherum coin has given me a big profit, I believe in Etherum because of its popularity which has been recognized for its liquidity, thus making me believe in investing in ETH and when there is a price friction I am still holding on so that in the end it gives me profit, another small profit that I get on Binance and TRX.