Which do you feel has an overall brighter prospect for the future?
In my opinion it is XMR, from a technical and team point of view.
However, once confidential transactions are implemented on to Bitcoin, it is hard to see purpose for any other privacy coin.
The recent market is prove the altcoins potential so future possibilities of altcoin is little difficult to grow in the market. All the investors are stay away in ZEC and XMR so we don't know how to survive in future market. But XMR is well known altcoin so finally everyone conclude the XMR. The ZEC is little lower than the market reputation so XMR is won the battle.