Although your reply is not really a recommendation (fortunately), I cannot resist to place this comparison here. FWIW.
Look at the "Specifications" (=features) for each of the systems.
That lack of features is probably accurate. MariaDB is a young (2007 ?), under-duresse derivative of an already problematically weak system (MySQL), and consequently derives its following mainly from the ranks of the mysql-encumbered (such as, apparently, SlackWare).
Greenfield projects can/should do better.
update: fixed link.