All depends. Sure Ripple has legs to go further, but surely its not a real crypto as it works with the banks, not replacing them. Sure I see Bitcoin can easily go up 100% or more in 2018. Easy to double your money, or day trade for real swing gains. How about have a look at some privacy coins like DeepOnion and Zoin. Surely these could bring in more % growth. Or check out Neo for maybe 200%+ increase in 2018.