Broward has done slightly better than Dade in 8A. I agree with your point, but there's not that many good teams in either county, IMO.
In dade, there's 6-7: Carol City, Central, Booker T, MNW, Columbus, South Dade, and this year Palmetto.
Broward: STA, AHP, Chaminade, Gibbons, Deerfield, and...