@MaryMargotMaynard
Buy and read both. The basic premise in both is arguably that sex/biology is real and to pretend this is not so is to do a disservice (and damage) to women. They are different books and both read-worthy in their own right. Joyce's is possibly a more straight-forward read so maybe it is the one to start with.
Stock's book is referenced so you can double-check any of the sources.
Joyce's isn't and she has explained why (in the Economist they don't reference, they check sources prior to publication and readers rely on that). She has said with the benefit of hindsight she should have but she doesn't come from academia where it is the norm, but from journalism where it isn't.
There are excellent reviews of both books out there. I wouldn't be put off because of one, particularly when it is more axe-to-grind than considered review.
Happy reading!