More on Monero vs Zcash (including usual armchair and bias)... https://www.reddit.com/r/CryptoCurrency/comments/70kx3g/let_me_clear_some_things_up_about_anonymity_of_a/ https://www.reddit.com/r/Monero/wiki/comparison
They're not so easy to compare due to being different approaches with evolving development in each. Here's a partial family tree, newest generally towards the bottom... https://getmonero.org/ - Monero XMR http://zerocoin.org/ https://en.wikipedia.org/wiki/Zerocoin https://smartcash.cc/ - Smartcash SMART https://bitcointalk.org/index.php?topic=846471 - Zerovert ZER https://zcoin.io/ - Zcoin XZC http://zerocash-project.org/ https://en.wikipedia.org/wiki/Zerocash https://credacash.com/compare - Credacash, license issues https://z.cash/ - Zcash ZEC http://zclassic.org/ - Zclassic ZCL https://zensystem.io/ - Zencash ZEN As usual, a few years / generations out will see new coins emerge that combine both old and new elements into more capable, private, anonymous, overlay transport, txrate, resistant, encrypted, trust less / mitigated setup, mixed, ringed, whatever, etc solutions. And exchanges, whether 'git clone and host on darknets', or fully distributed (blockchain / p2p), and whether funds-on/off-exchange, are complete greenfield and a highly needed ecosystem part that's still missing. Some early examples... https://bisq.network/ https://www.openbazaar.org/