All of them was running with the zero knowledge. But KOMODO was preferring for my personally.
https://coinmarketcap.com/currencies/zcash/At this time the supply at 216k.
The current price of ZEC 0.056 and assuming about if the supply was an increase until a million ZEC and the current price will be divided.
Might the other price of ZEC if the supply will touch a million.
0.056/3(at a million supply the total was tripled with the current supply) 0.018 for each ZEC.
This trend will be running for few years later.

Agree. I think that after the first four years of mining since launch of Zcash, we will be able to see its true price. Miners will keep mining for founders reward until the period of four years is over, which is why I think that by then the price of ZEC would stabilize.
If I were to pick the best Zero Knowledge Proof coin right now, it would be Komodo. It has pretty amazing features like dPoW which will make the network as strong as Bitcoin itself. Just sharing my thoughts.

That is right. But the price drop rate has already reduced.