Dash is very dodgy, I wouldn't trust it. The solutions "supernodes" etc sound like the people running it don't really know what they are doing. Monero sounds much more solid to me with the ring signature system. I personally use neither, but I can see the appeal to those who seek high level of privacy.
However this is about 5th article I see about zcash, and the thing hasn't even launched yet. Maybe they should stop marketing and instead try to actually deliver something.