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My advice is to go with tracking mount newtonians of sufficient size to bring galaxies to view, so probably at least 10". Big Dobs are great but once someone bumps it, there goes ten minutes trying to get it back on target. And let me tell you, no amount of telling kids " don't touch the scope" will stop them from leaning into it and pushing it off view. The tracking mount, once well setup, is easy to get to return to target, and less work for the outreach tech support people.
SCTs and their like are more compact but are notorious dew magnets, meaning your going to need good heating, generally speaking a Newt will hold out longer when things get damp.
SCTs are also optically slow, faster is better in my opinion.
Have fun.
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