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...
With the Seraphis upgrade coming down the road Monero sender privacy will be just as good as Zcash using full membership proofs without all of Zcash downsides.
Ring signatures have never lead to anyone being discovered or busted in practice. They have been robust enough. 1 in 16 chance of guessing sender correctly. And with every hop it is 1 in 16^x chance (x being number of additional transactions).
Chance of correctly guessing sender after 3 hops:
6% -> 0.4% -> 0.02%
The amounts and recievers are still completely hidden.
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