Yes ofcourse MariaDB is better than MySQL. Here are few reasons to support my answer:
MariaDB supports more storage engines
Supports these:
- 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)
 
- OQGRAPH.
 
- SphinxSE.
 
- TokuDB.
 
- CONNECT.
 
- SEQUENCE.
 
- Spider.
 
- Cassandra.
 
MariaDB has many different improvements and optimizations in the speed of data processing.