Apple Classroom - Bluetooth 4.2 vs. 5.0 on an iPad

What impact does Bluetooth 4.2 vs 5.0 have on a teacher's iPad which is used to control Apple Classroom?

I am planning to purchase either a new iPad Air or iPad Pro 10.5, but am concerned about Bluetooth. For Apple Classroom to function student iPads need to be connected to the same wifi network and have Bluetooth turned on. However, I don't really know what data is transmitted over wifi, and what is sent over Bluetooth - ie. I don't know if the speed / data increases of Bluetooth 5.0 would benefit an iPad being used to control a large number of student iPads.

The class sizes I will use Apple Classroom for range from 15 to 50 students normally, with exams up to 150. As the number of devices gets so large, I just assumed that Bluetooth 5.0 may be very beneficial.

In summary: I want to chose the best iPad (iPad Air 3 or iPad Pro 10.5) for controlling large numbers of student iPads using Apple Classroom.

Thank you very much for any assistance!