I've been thinking a lot about this issue. I heard more than once that many are discussing this topic. Is it safe to invest everything in one, two cryptocurrencies? Or to distribute all the money in all the coins available for this amount?
A wise investor will spread his portfolio because it is the safest thing that he can do, now that the market is uncertain it's not safe to put all your faith in one coin alone, in my experienced I never know any guy who will just go for one coin when there are so many profitable coin in the market.