Well, if you are tackling this question in this way than the first question should be:
What is the job-description of the profession of "Queen"?
Only with a clear jobdescription you can than specify targets the Queen should accomplish and then define measurements in which the achievement of these targets is accomplished.
You seem to assume that implementating ISO standards and handbooks is a measurement for the professionalism of a queen, but if that's not in her jobdescription it's a moot point.
So as long as we don't have one official jobdescription for all queens in the world (maybe two, one for queen-regnant, one for queen-consort), any "measurement" we think we can apply is just our own vision on what a queen should do and when it comes down to it, that's nothing more or less than an opinion.
This thread is about opinions and therefore if someone considers Q.Mathilde or Q.ElizabethII or Q.Sonja or Q.Beatrix the most professional, all these opinions are equally valid and are not right or wrong.
(i voted for QEII in this poll, but only because the rockband Queen weren't on the list