the bigger coins (eth, ltc, btc, ...) will give you 'guaranteed' profits, probably about x10 returns, but some of the smaller ones or current ICOs can easily get x50, all they needs is a good partner or some media coverage
I would rather take a big risk and investing all of my money into Bitcoin I believe this crypto coin. By looking at its great performance for few past months, all of my doubts are very clear now. Define has $8,000 and still people say that it is just the beginning.
I also believe that we are just getting started and a lot of many surprises are still waiting for us.
Bitcoin has proved itself to be the best investment tool in the past and will remain this way.