Seven decades of personal experience. That's enough research for me.*

Of course, YMMV.

* Women are more likely to spend time and/or money to do a good job. Men are more concerned with self-perceived 'success'.**

You want a good lawyer or doctor? Get a woman.

You want faster, more accurate throughput in a supermarket queue? get a woman.

You merely have to observe.

** Sorry. I really did just notice it as I was about to finally hit the 'reply' button. And I just had to laugh. As I reply to somebody called 'DamnYuppie' about males and self-perceived 'success'.