I think the 12" is significantly longer and larger than the 10" - for transport purposes. The 12" really is the size of a big hot water system - and will definitely be much harder to fit in a standard car - in fact,it probably wouldn't fit at all. A mazda 626 ain't a big car, I think you'll be lucky if the 10" fits, the 12" no chance.
While aperture rules, if it's too big and heavy to transport that you don't end up using it, it's a waste. The best scope is the one you use.
You could buy the 12.5" truss dob in the Buy/Sell forum - they break down into smaller components so it can be transported without problem in your 626. And that also sounds like a quality scope. Depends on your budget.
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