do not put eggs in one basket, I think you'd better invest your money in some popular coins, such as eth, neo and others. this way the profits you get will be bigger than you invest in one coin only.
But this is an exceptional case and exceptions are everywhere. Bitcoin is the mother of all digital currencies. It is the foundation of digital market. It is the only coin that has produced millionaire so far. Definitely, investing in it is the best thing that a person can do to himself in his whole life. Due to large community of supporters and big investors, bitcoin has the brightest future among digital assets.