User blog comment:B214/Question and Answers/@comment-24248485-20140103094808/@comment-1359322-20140103115436

Sirzechs is blessed with the Gremory's magic talent and Bael's Power of Destruction, so Sirzechs can be considered to be a Devil that would have filled up all four categories of the Rating Games which are Power, Wizard, Technique and Support. Rias can only be considered as a Power-Wizard type.