Yes ofcourse MariaDB is better than MySQL. Here are few reasons to support my answer:
MariaDB supports more storage engines
- ColumnStore, a column oriented storage engine optimized for Data warehousing.
- MyRocks, a storage engine with great compression, added from version 10.2
- Aria, MyISAM replacement with better caching..
- FederatedX (drop-in replacement for Federated)
MariaDB has many different improvements and optimizations in the speed of data processing.