Dash has become really popular as compared to those two.but it also comes with anonymity privacy.its better to invest in dash rather than monero as it market is rising and price has greatly rised up.
I feel like Dash is here and popular since .. like forever. Years.
First I felt like I missed the train. Then I didn't like the re-branding. I liked the Darkcoin name and I knew of another coin, DashCoin, so it was not a fair move.
Then I felt like others' claims (that Dash may not be as correct and anonymous as it first looks) may be true.
Now I feel like people start leaving Dash and the coin is losing popularity.
Monero should have faster development, but slow is still better than none, so I don't complain.
Zcash tries to find its way onto this world. When it will be out of beta, when it will be on the markets and when devs from other areas will review the code and give fair opinion about it.. then we will know what's Zcash about. Until then I find the Zcash discussions only attempts to create buzz around this project.