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 don't have Bitcoins. Mine currently is Ethereum. Ethereum is in good shape after a lot of people have complained about some of the things being experienced.
Holding Ethereum for some time in the future will be very good in my opinion friend.
And you won't be disappointed if you own Ethereum today.