I mainly do aircraft in 1/72.
I’m not an impatient modeler but I do need to see regular signs of progress to keep my energy up for a build and see it to completion. These signs of progress happen with a bit more frequency in the smaller scales than they do in the bigger ones.
Additionally, most of the time I’m after a good representation of the subject on the shelf, not a heavily detailed replica accurate down to the pilot’s body odor in the seat cushion. If the external shapes and dimensions are right and the cockpit looks passably like the original through a closed canopy, I’m a happy camper.
I find 1/72 works well to find representations of most of the aircraft that I really want in my collection.
In the case of larger aircraft like bombers and transports, I take it down to 1/144.
Case in point is that I’d love to get my hands on one of Italeri’s 1/72 B-58 Hustler kits but I have not at all got the room for it and don’t suspect I will any time soon so I took Academy’s nice little 1/144 gem of a B-58 instead. Its a very nice little kit that I think will satisfy my desire for a B-58 in my collection quite nicely.
There’s also the matter of how to allocate the limited shelf space, what do I want for sure in 1/72 and what could I be satisfied with in 1/144. If I wanted a Harrier it would be 1/72 all the way. On the other hand, Trumpeter’s lovely 1/144 F-22 Raptor handily satisfies any urge I have to get a representation of that beastie on my shelf.
Its all about priorities really. I used to buy bigger scales when I had more room and time and was trying to superdetail everything. This led to an intimidating stash, an unfocused approach to building things and the hobby in general and the superdetailing end almost took all the joy out of the hobby for me.
I took some time to reconsider the hobby and what I wanted from it, got rid of anything over 1/72 that had not been started and focused on building in a way that I could reasonably build what I had on hand without old age catching me first (and I’m not very old really).
So, I went back to basics, gave up the superdetailing (though I do occaisionally use some aftermarket if I feel its really warranted) and relearned how to be satisfied and how to say “good enough” to a model, put it on the shelf and move on to the next one.