The comparison with MySQL/MariaDB is unfortunate, given that since the "split" MariaDB has shown itself to be every bit the corporate owned "FOSS" project while its supporters still harp on about how terrible oracle is for OSS, without actually acknowledging the real history of each respective project and accompanying company.
Given that MariaDB the company is now owned by a private equity firm, I doubt it's going to get better.
Still got Percona, but I'm not sure what their status is at the moment.