I personally did AQ to 15 before started back on my BK, now working on king to 15. But I know a lot of people, including some inside my own clan who are firm believers in maxing Queen before going back to king, I just personally feel that I can get king to 15 much quicker than queen to 20 then 25 then 30 so I'd rather stop for 4-6 weeks on the queen and keep my king upgrading non stop in that time and have them both to 15. Then I'll start on my Queen again.
