My friend has a 32". He has a minivan dedicated to the scope. He has an electric winch to help get it in and out of the van. But what amazing views!
If I were putting it in an observatory, I would go for the 30" for 44% more aperture.
If I were going to be moving this around my property and taking it to remote sites frequently, I would go for a 20" truss Dob that I could dismantle and still be able to move by myself.
I once watched a guy with a 32" at Stellafane -- he sat in his lawn chair drinking something and said to his two teenage daughters "OK girls, get the scope out of the trailer and set it up." -- and they did!
I saw another guy there with one of the four Obsession 36 F/5 -- roll it down the trailer ramp, fold up wheels, insert poles, use a winch to crank it down to attach UTA -- it went back in the trailer pulled by an electric winch powered by the tow vehicle battery. Years later - observing with me and my 20" - he said "I really wish I had just stayed with a 20 like yours! I think I'll sell the 36 and go back." -- but he never has. The 36 is currently in a 'Dob-servatory'. His best line: "Owning a 36 is a life-style commitment - like getting married or becoming a monk!"
I have a friend with a 36" F/4 that he stuffs under the cap of his Chevy Silverado pick-up - poles sticking out the back! While two very committed people can get it out and assembled - it really takes 4 ( no ramps - all lifting ).
I expect my on-order 20" F/3.5 to be "grab & go" at home. I grab the wheelbarrow handles and roll the fully assembled scope out thru the double-wide French doors on my house to the observing area - tweak collimation - insert eyepiece - observe - end of night reverse the procedure. I have a trailer with a ramp rear door - but only very rarely travel alone for observing - and two people can easily lift this scope into a pickup bed. I would bet that even a 22" is a 'single person scope' -- 25 is pushing it, a 30 needs two people.
For some reason I've only rarely observed thru a 25" -- I'm much more familiar with the 'jump' between a 20 and a 32 to 36 - where the difference is quite noticeable. I would just guess that the visual difference between a 25 and 30 would require careful looks thru side-by-side telescopes pointed at a dim, low contrast target - galaxy cluster or maybe M-101? I doubt that the owner of the 25 would slink back to his telescope with a glum look on his face and start haunting A'mart for used 30's.
Edited by George N, 23 July 2021 - 04:46 PM.