Th bigger scopes will definitely bring out the "WOW" factor and of course everyone wants to look through it. But if you're in a group situation trying to teach a number of people, a smaller, easily accessible scope is best.
I would think an SCT would work best in this situation because most simply have to walk up behind the scope and have a peek without too much trouble. A reflector may require a variety of standing or crouching positions.
-------------------- It is better to build a boy than try to mend a man.