both these magnas are about high school delinquents. they both are about uniting the schools deliquents.
difference is the teacher is trying to put the kids in school on the right path, while crows it's the students trying to unit for power.
Onizuka Eikichi and Danma Ryuji are best buddies waiting for their love life to bloom, but in order to do this they must cast aside their delinquent ways. Eikichi and Ryuji clean up their act, transfer to a new school, and become hard-working students. This act successfully attracts the ladies, but it also attracts other delinquents. With their lives constantly under threat, Eikichi and Ryuji's secret identity as the infamous Oni Baku biker gang is revealed! The end result? Trouble! With danger abounding, the Oni Baku duo face the odds and ends of love while solving all of life's problems with aggressive violence!
Shonan Junai Gumi and Crows have quite a lot of similarities. Both deal with delinquents and gangs being formed in high school. There is strong focus on character development in both series and former foes becoming friends is recurring theme as well. If you liked either of them I think you would like the other as well