I agree with the 8" sweet spot in SCTs Tony, I thought long and hard when buying mine about getting a larger (or smaller) aperture, but the 8SE seemed just right in the performance vs portability & FOV spectrum.
I'm moving to a dark site in about 5 months, and plan to set up an observatory then. I have my eye on a 16" Dob for that - well above the 12" sweet spot, but the consideration is that I don't ever plan to move it! So as you note, the sweet spot can vary depending on the circumstance.
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