Also, referring to your original post, it really depends a whole lot on what you are doing. A variable, high power, adjustable objective is just the ticket for dog town. You can scan the field, find the area you've spotted the furry little hole digger, then zoom in for the kill shot. But, if you are poking holes in paper, a fixed power has bigger internal lenses, generally tracks better, and everything else similar, provides greater contrast because of those bigger inards.
Plus, fixed power scopes are very durable, because they don't have a slice halfway through the tube just in front of the ocular lens housing. It is easier for a technician to line up a fixed power lens set during construction, because there are no "variables" in the geometry. Last, even if you are talking about a deer slayer, if you are walking and generally banging the thing around, a good 4 power will get you to 200 yards, have gobs of FOV, and is super rugged.
There just are very many fixed power offerings anymore, because the "market" wants variables (at least in some part because of ignorance regarding the added vulnerability to damage or lost accuracy inherent to sights with moving parts).
Hope that helps.