expected goals is a pretty straightforward measure of shot quality that also incorporates quantity. you can debate the methodology behind how that "shot quality" is quantified (read more here:
https://jetsnation.ca/2020/01/07/exp...els-explained/) but I think it's pretty sound, logically
you can isolate expected goals against and convert it into a rate per 60 (it's a cumulative stat). I think it paints a far clearer picture than, say, shot attempts