Comparison MySQL vs Percona Server vs MariaDB

Question

MySQL

Help me find a comparison of these products, when I came across, but now I can’t find it.

Answer 1

Google it.
techportal.inviqa.com/2012/03/15/mysql-alternatives-to-mysql/vbtechsupport.com/657/
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Answer 2

Percona server is a MySQL build (by Petr Zaitsev and co) with the XtraDB storage engine enabled by default. Differs from MySQL+InnoDB plugin in better performance/scalability, especially on modern multi-core servers. Functionality has also been improved - more statistics useful for optimization, etc. Fully compatible with innodb tables, that is, you can switch from innodb to xtradb and back without problems (if you do not use some xtradb-specific functions, such as a smaller page size).
MariaDB is a build from Monty, synchronized with the MySQL codebase and fully compatible with it, i.e. can act as a transparent replacement for MySQL, while having a number of advanced features, including performance optimizations and comes with a set of additional storage engines