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Hi,
I have a 12" as well and very happy with it. Only recently though we bought a new Hyundai wagon for wife and it wont fit in it. Never really expected it though as I have a Berlingo van and all my gear fits in there including all my other gear.
If you are looking at apeture then it is the way to go, but if you are using it for school use depending on the size and what you expect to see then 10" maybe the way to go. It will be a good size for children reaching eyepiece at zenith.
At 1500mm focal length a lot of objects disappear out of view quicker than a smaller scope so you will need to re-adjust often throughout a night session. Motor driven would resolve it.
There is a lot to think about when selecting but as i have been at schools for club activities I find the DOB without drive nice but sometime hard to manage when you have 20 children wanting to look at the skies. Although I haven't used my DOB in schools I did assist others with their scope during a couple of sessions
It suits me well as I have built a EQ platform that allows me to EQ track across the sky. For planetary imaging it is brilliant.
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