As a former MS tech teacher, I would encourage you to get something durable and with easily accessible replacement parts. My last colleague was in charge of a Module lab which had very light duty devices. The labs were constantly down. MS kids are hard on tools. You want something indestructible.
You also need to look at how long it will take to do the work you want done. Nothing will be more frustrating to the kids if they have to set it up and leave before it is finished. If it were me buying this for my lab, ( I made my own cnc router back in the day for class and had a Maxnc mill too.) I’d go for the X carve because I could have multiple pieces set up on the bed with easy access to them. I’d have a supply of extra wheels, bearings, screws, router, and belts for replacement…in other words spare parts on hand. The X carve is also expandable if you find that you want to make bigger parts. My mfg. unit was one of my favorites. Gumball Machines and Amazing folding stools among other things were a lot of fun and could be adapted to cnc pretty easily.
You could always make an enclosure to deaden noise and help with the sound too, if fact the guy that replaced me did that to the one I built.