In isolation, shielded Zcash sender privacy is technically better than Monero, but that is all. Example:
Monero:
6% Alice sent $[?] to [?]
Zcash:
[?] sent $[?] to [?]
But this small advantage is overshadowed by many other problems that I showed you in that link.
Some big ones:
Optional privacy - Very few users to hide among.
No layered privacy like Monero - if privacy breaks everything is potentially exposed
IP not hidden by default - what good is privacy if your transaction is accidentally linked to your IP?
Dev tax - lmao
Has known devs, a CEO, and a corporation - easy targets for manipulation and state force and regulation.
and much more...