[NF] MySQL InnoDB seems to use more space than MyISAM....why??

tech: MySQL/MariaDB backend, version 5+

Anybody know why the same field structures but using the Inno engine type causes a table size to be much larger than if it's a MyISAM table type? I do realize the benefits of using InnoDB for transactions, btw.

Just curious why MyISAM smaller, given same structure.

Thanks, --Mike