I believe that aperature will always rule...
Some of the "really big" scopes just compensate for changes in the atmosphere with corrective optics...in the end it is budget that is the limit not the size
If you are talking about amatuers I'd still say that aperture rules...
A "small" big scope is 12.5 inches...a "big" smaller scope is 10 inches...so for "normal people" I'd guess that would be in the neighborhood...
Having said that, I've got a 15 inch and could easily handle larger except I'm not fond of climbing ladders...when given a choice (and having the time) I'll wheel the 15 inch out every time in preference of the other scopes...if time or travel is a constraint I'll choose differently.
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