Make sure you take into account how big and heavy it is.
The 12" is significantly longer and heavier than the 10". The 10" is quite easily portable for 1 person, the 12" is really pushing it.
You'll need a bigger car to fit it in, and won't want to have to be moving it around the place too much.
Of course aperture rules, but just remember to think about the other side effects too. Good luck!
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