A good WNBA team would kill an "average" high school team.
The problem is that your average high school team plays stupid as fukk. Hell, even a lot of "good" teams play stupid. The woman's team would have a strong game plan, run plays, hit their shots, not make stupid errors...they'd control the game.
However, a strong, elite high school boys team that had talent, height, and played smart should beat them, I think. Like one of the nationally ranked schools.
You're talking about the U17/U15 NATIONAL boy's teams or professional development squads.
That team would wash a lot of MEN'S college squads.
And I think most of those matches are scrimmages where the pros aren't playing to win, they're shaking off rust and experimenting with lineups and shyt. Though I think a good U17 team would beat the WNT in a real match too, it would just be closer.