MariaDB vs Percona: What are the differences?
Developers describe MariaDB as "An enhanced, drop-in replacement for MySQL". Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry. MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance. On the other hand, Percona is detailed as "With more than 3,000 customers worldwide, Percona delivers enterprise-class solutions for both MySQL and MongoDB across traditional and cloud-based platforms". Percona delivers enterprise-class software, support, consulting and managed services for both MySQL and MongoDB across traditional and cloud-based platforms.
MariaDB and Percona can be primarily classified as "Databases" tools.
MariaDB is an open source tool with 2.82K GitHub stars and 864 GitHub forks. Here's a link to MariaDB's open source repository on GitHub.
We actually use both Mongo and SQL databases in production. Mongo excels in both speed and developer friendliness when it comes to geospatial data and queries on the geospatial data, but we also like ACID complied hence most of our other data (except on-site logs) are stored in a SQL Database (MariaDB for now)