as many people say that you can only hold 30 to 10 people in one discord call if you were to make a server and add a chat or a VC you can hold up to 99 which is more than zoom and you can also use the text chat, general chat or anything else that you add and the best part you can hold pretty much infinite people I have personally seen servers with up to 100k people in it. One of the better parts is that you don't necessarily have to download it you can search it up on google and make an account it's as easy as that. Another thing is due to the original purpose of the website/app is that it's very customizable meaning that your students can customize heir profile pictures and names, but not to worry in a discord server you can have it where only you can change their nicknames so let's say things get too confusing or you want to be able to see who they really are you can just change it to their name. One last thing I will say is that you can have customizable ranks and so on so if you desire to split people into teams you can do so and with that, you can customize what they can do like give people ranks or de-rank them. Like I mentioned earlier about VC's you can also screen share and do videos so you can see their screen or their face.