Just remember: IAAJ - it's all about the jingles.
DOUBLE ROW of jingles for MAX VOLUME and SILKY SMOOTHNESS of rolls. This tambourine will be playing against the force of combined adolescent fury. You're going to want the second row.
BRONZE and SILVER will make your tambourine sound like CASH MONEY. They are superior metals and will achieve the sound you dreamt about the year you played Holst 1st Suite and realized that the second movement just doesn't get off of the ground with a stellar tambourine timbre. Bronze produces a darker tone and silver produces a brighter tone. I prefer bronze for most applications.
Offset or inline rows? Not a big deal at this level.
Remember when I said IAAJ? I lied.
For high schools, consider getting a synthetic head for MAX DURABILITY and ALL-WEATHER readiness. A natural skin head will need tending, coaxing, and warming to achieve the desired tone. The synthetic head is the "set it and forget it" method, which I highly recommend.
All that being said, you are better off spending $200 on a Grover or Black Swamp tambourine. These will last a long time, come with a case, and will sound great with minimal maintenance.
I'm sure LP and Meinl probably make a great option with similar qualities at a lower price point. Maybe it'll be great. Maybe it won't. I'm not the tambourine police, do what you want.