I recommend Wordpress because it is massively, massively popular and I recommend Drupal because it has a very good reputation, and if you are thinking of selling your skills you can probably charge more for Drupal skills than Wordpress. In terms of coding styles Moodle is somewhat on its own and so it is not a very good basis to select a CMS. Overall I advise getting some Wordpress experienceand investigate the various ways of integration Moodle and Wordpress.
Comparisons and advocacy
Learning Moodle and another CMS
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