Percona DB (for performance)
Percona DB would be a nice addition to the packages available on Cloudways (if you care about performance).
What You Need to Know About the MariaDB & Percona Forks of MySQL
TL,DR summary: MariaDB is better for advanced features, the latest security and adapting to new tech. Percona excels at database performance and diagnostics. Either one will put you in good company with cutting edge technology firms around the world.
Marcus Quinn commented
Its the monitoring & profiling tools that you want from Percona to find slow queries:
I agree, I would like to see Percona for Magento.
You can already replace MySQL with MariaDB on any server: