I do prefer adjustable objective scopes, especially the side focus models. You should consider these 2 things:
1. Magnification - AO becomes useful at about 12x for most long range shooting. At lower powers, our eye resolution just isn't good enough. On a 10x scope, IMHO, I don't really need AO. On a 40x scope, I would want it for all ranges of shooting.

2. Distance - My understanding is that at farther distances, the adjustment is very fine, but the error could matter more.I think the size of the error can be much greater at like 25 yards. That is why all airgun/22 target scopeshave AO and also whyshort range benchrest guys must have this feature. Of course, we are talking about holding groups under .1 MOA here. Not necessarily big game hunting.


So for big game hunting, I basically use rule 1 to decide if it is a needed feature.