Bitcoin: Of course, it is the largest and the whole market is following the Bitcoin course for now! You can not act seriously in cryptocurrency and pretend Bitcoin is not there. There are still the same problems for Bitcoin to tackle: transaction costs, scalability and arguments surrounding centralization of mining and developers that the community is struggling with. If the community around Bitcoin is not able to solve these problems, it is very questionable whether the mother of all cryptos can keep their market share.