To distill it into quick and easy terms, Zcash differs from Zcoin in the following ways:
Both Zcash and Zcoin hide the identities of the sender and recipient. However, Zcash additionally obfuscates the transaction amount.
It is currently very difficult to detect hyperinflation in Zcash because of the obfuscation. It is unauditable, where Zcoin can be audited because its transaction history is available.
Zcash’s technology is uncharted space, and there is hesitancy regarding the assumption that bad actors will not collude. Zcoin’s technology has undergone much peer review.
Zcash uses more memory and has longer transaction times, while Zcoin requires more storage space