I'm a big believer in privacy coins, and there will be huge amounts of growth in this arena. Zcash and Monero seem to be the big boys on the blockchain. That being said I think some of the smaller players with good marketing like Horizen (formally Zencash), Bitcoin Private and PriVCY are worth a look for investors. 
BTC
I think you're right. I also plan to invest in this coin and hold these coins for a long term. But it seems to me not worth all the money to invest in Zcash.BTC