In my opinion, bitcoin is the best investment at this time. The other options are either too risky or scams. Do your own research and be careful before investing.
The ZCash could be the best invesetment in the long term. But the price now is too high to be investable.
Same as bitcoin it is very high to buy but i think better to try ethereum since the price is going down and i think you can make a good profit after the price of bitcoin is going down again.. and some investors again will going back to ethereum.