zcash frequently complies with regulators and doesn't have good privacy by default (privacy is opt-in). Coupled with lower usage compared to monero, it results in a really low anonymity set. It's very centralized and they keep making deals with regulators, that's why zcash is getting back on exchanges it was previously delisted. Technically, zcash has better privacy since zaphir shields are superior to blinded signatures (used by monero). Monero can potentially upgrade to zcash's zaphir but that requires a hardfork.

The *privacy tech* that Zcash uses is better, and their researchers are great. But Zcash itself not so much... Bad implementation of the tech and design decisions: optional privacy, not fungible, no default IP privacy, trusted setup, dev tax on mining, centralized corporate entity, transitioning to PoS, etc. Bias source obviously, but much of this is true if you DYOR:

/XMR/ Monero General Info-Dump