I hold the view that Cardano coin is very trending and in demand at present. The coin is designed by the Cardano foundation and partnered by Charles Hoskinson, one of the co-founders of Ethereum coin. Cardano is very popular, because this coin is focused on offering the key features of 3 highly trusted coins: Bitcoin for storing the value, Litecoin for cheap and fast Peer-to-Peer transactions and Ethereum for smart contracts.
I think you should pay attention to XTRABYTES (XBY). It is argued to have bright future in 2018. It is a modular blockchain platform designed to provide significant increases in security, scalability and decentralization opportunities over the current blockchain technologies.
In my opinion, Ripple is better. I think this coin, which only lit the world a year ago, will take over the world especially in transactions, due to its tools proficiency in cross-border transaction.