Spectrecoin (XSPEC) has the tech behind it to become a top contender for best privacy coin. They have released stealth staking on a trustless set up. I recommend checking them out for yourself though as youll love what you see when you dig deeper.
For a mega low marketcap project I also like Privcy which was a fork of deeponion. Lead dev left and the price plummeted, community stepped in and one hardfork later, development is back underway and community is growing by the day, price is only 48 sats at present so easy to pick a little up and HODL