Love this post! and Especially since you called out two of my favorites, XRP and ONION. XRP will go up 8x and onion will go to the 5th dimension of Stellar deep space! Seen you on the moon brother!
Why didn't you vote?!
To the OP...
Ethereum and Ripple have the best business plans and represent the greatest opportunity for price growth because they're relatively undervalued (I think) right now.
Honestly, I hope Bitcoin doesn't continue it's meteoric rise in 2018. I hope it retains value, cools off a bit and in doing so it'll earn greater respect among the masses as something that's here to stay.