simple in my mind.
if there is not an issue is transporting a 12" over the 10" then go the 12" without doubt!
2" extra diameter is lots of extra light.
I love ken's 12" dob for views of galaxies and the extra detail on planets.
In terms of transporting, what vehicle can't take a 1.5m long tube but can take a 1.25m tube????
Decent Eyepieces can wait as your eye's / brain need to be trained to see detail. It has taken me 12 months to start to pick up doubles, galaxies thru the finder etc.
Crayford is a must!
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