Although Bitcoin has taken up 40% the coin market. But is it more worthy to invest in bitcoin? Since bitcoin can never replace the paper currency for the moment due to many complicated reasons, and most bitcoins are already acquired by a small sum of people. So if a kind of currency can't be circulated, what's the meaning of that coin. When it comes to ICO, and the release of altcoin, it means that you are investing in a company, you are holding equity in the company. If you think this company will have a bright future, it's always worthy to put your money in.
Bitcoin is cryptocurrency not currency, government will take full control about currency because that is the main financial instrument and cryptocurrency is similar ( some people say " same " ) with commodities product ( gold, silver, etc ), just like fashion. Crypto is only alternative and because we can make profit in easy ways, fast and cheap transactions, we can't say it can replacement currency. Even currency has future with their ICP project, don't think too far because currency is main goal.