From a technology perspective zk-snarks is more private than RingCT is.
I'm not saying Z-cash is better, I am saying zk-SNARKS are better than RingCT.
FCMP++ would make their privacy at similar levels then Monero would be the obvious winner without a doubt.
But right now, their tradeoffs, and privacy benefits are similar.
I personally use Bitcoin, Monero, and Z-cash, as well as other payment types when I have to.
I'm a multi-coiner but I prefer, Bitcoin, Monero, and Z-cash the most out of the three, as I see they have the most plausible real world utility currently.
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Theoretically RingCT can be just as good as shielded Zcash in terms of anonymity set per transaction. It's just not practical to do though.
Sure Zks are cool but they depend heavily on the shielded transaction pool, you have such a tiny anonimity compared to Monero's. Zks are probably the only cool stuff that came out of Zcash, and it got ruined by everything around it in Zcash.