I would not recommend investing in Zcash. It is better to invest this money in BTC or ETH. I think this is a good choice.
The price of Zcash moves is not comparable to Ethereum. If I have spare cash I would buy both. The growth of Zcash is slow but if you look at the price history of Zcash, every time there is an event, the price slightly go up. Next event for Zcash is next month according to the road map so if you are willing to take a risk, buying now I guess is a good idea.
That is right. Maybe I will buy a few more coins like Monero or Bitcoin Cash.