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The 2" larger diameter in the 12" gives a 44% larger area than that of a 10".
10" or 12"? IMO, a 10" dob is probably the largest that will comfortably accomodate someone sitting in a chair while viewing at zenith (directly overhead) without straining- that is the main feature that dictated my choice of a 10". It is the most common form of seating- don't discount this!
A properlly constructed observing chair should overcome this. But you will need to have one and not all novices can balance and view at the same time (novice meaning general public with no experience).
Solid tube: 10"
Collapsible tube: 12", Just like Norm.
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