Besides the particular brand (which you seem to have picked), there are some generalities that apply to all scopes (and bins).
Obviously, larger scopes are heavier and more awkward in the field (Duh), but...
Larger objectives give you two things (assuming that the scope is of high quality), a tiny bit of more resolution on overcast and raining days, and less resolution/more mirage on sunny days.
A high power match shooter might want the increased mirage for reading heat waves and the wind, while a PD shooter would want less mirage so they can spot the PDs.
For the match shooter, the 80mm or 100mm might be fine, but the PD shooter might be best served with a 60mm, 50mm or smaller, even at the same power.
The big area of importance for scopes, that is very often over looked is the eye pieces.
I have a limited production 60mm Bushnell 60mm "ED" scope that the objective is state of the art. But the reason that they were "limited production" was that he eye pieces for they whole Bushnell line were (and are) crap, so users didn't get any advantage of the very expensive scope.
I salvaged the scope by fitting high quality Mirador eye pieces, but most users did not know of this option.
Here's an interesting page on the importance eyepieces. The writer is from the bird watching community, and if you think WE are fussy about optics, you haven't met a bird watcher yet...
I bought one of these scopes, JUST because of the eyepiece... but it is huge.
For field use, I think a LER or WA 20x to 27x would be fine, but a variable would be much better if mirage has to be dealt with...
... across a dog town, a 25x might be too much to see anything because of mirage.