Not my saying but I only borrow from the best...
"the only silly questions are the ones you dont ask"
Go for the 12 inch or you will always be wondering...
and another saying..
A bad decision is worst than no decision or indecision.
I had, (er actually I still have it) a 235mm not a 10inch but close... the 12inch beats its socks off.
The optical tests I have done with my 12inch tells me that anyone who levels critism at the optics have extrodinarily high expectations.
BUT the larger the app the longer the clouds will stop you from using it
.. and believe me once purchased that will be your only concern
.
Good luck lets move on to what additional EP,s to get
.
best wishes alex