Which 2-Digit Parent Mathematics Subject Classification Should I Pick as my Primary Classification?

Suppose that you are in the situation that I am in terms of Mathematics Subject Classification, as shown in my tweet below (each term corresponds to one of these), and you are now supposed to pick one of these as your primary classification on the job market. (Note that I am not on the job market, but there was a time long ago when I was a junior scientist and I was faced with this situation.) Which one would you pick?

The Mathematics Subject Classification does an "awesome" job of classifying me: https://t.co/chQW9cCotC

This classification ontology is horrible for applied mathematicians in general, and that can really hurt them on the job market. pic.twitter.com/DnYYBI2Muh

— Mason Porter (@masonporter) November 16, 2018

Applied mathematicians face this all the time (though my own research portfolio is a particularly extreme case of MSC failure) on the job market in their job applications for postdoc and faculty positions in mathematics departments in the United States. They forced to submit the standard American Mathematical Society (AMS) cover sheet, and they are then categorized according to an ontology that fails them utterly. It is systematically unfair to applied mathematicians.

The MSC needs to be revamped.