Monero is considered one of the top.
Otherwise, zksnarks has very good potential overall.
When i say top, i dont care about marketcaps. Any coin is just couple hundred million tethers away from being the top coin.
Bitcoin is overhyped and not useful for anything at the moment, and far from its original purpose. IF you knew anything about monero, you'd see why it is actually more useful and true to crypto-currency spirit than others.