Best crypto currency?

Bitcoin (BTC) is not worth investing in at this point IMO. The ship for making money on BTC sailed months ago.

Ethereum (ETH) has been and will continue to be a strong BTC alternative. I believe they will continue to rise, but may level off as their current growth isn't sustainable.

Ripple (XRP) will *hopefully* stay on the rise through 2018. Although the chance to make big money with them isn't like it was in December when they were still in the $0.70 range, the company isn't going anywhere and their technology is solid. While they'll NEVER be in the BTC range per coin, there's no reason this coin shouldn't see $10-20-50 in the future, especially if Coinbase adds them.