Which program should I join?

I am looking over the different options and not seeing any clear answer about which of the programs I should join.

 

I am part of a private high school and I intend on making apps that are just for use within the school but I am not sure that I understand what adavantages or disadvantages each of the program would offer me.  If I don't want the whole world to be able to download the app, I assume I would have to go the Enterprise route but I don't know how internal distribution would be that much of an advantage for us.  And since we're not a college, I can see us not qualifying for the University program.

 

Thoughts?  Suggestions?

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