Both dramas have these "hooligans" in the school. In Gokusen it's only one class while in Majisuka Gakuen it's the whole school. In Gokusen they're good hearted but misunderstood while in Majisuka Gakuen they just fight for fun to see who's the top of the school.
A lot of sensless fighting, the people who fight Adachi all want to folow her like Maeda.They both seem to be comedies to me but Majisuka Gakuen seems more like a parody, but the humor is more obvious in Yankee-Kun.
Both dramas centers in a high school full of students who fights with each-other all the time. Then a transfer student comes to the school and school starts to change. Plus both of them seems to have their powers activated when someone asks "Are you serious?" or "mama this mama that. Are you mamas boy?".