This is of course true, assuming everything else being equal (same brand, model, quality of glass/optics). In practical usage, IMO, the differences are pretty negligible, especially if you are comparing different brands.

In my hunting, the 2-7x makes a little more sense since I hunt in heavy cover with a lot of climbing. I've yet to take a shot over 75 yards. 7x is more than enough out to 200yds assuming I ever get such a shot, and the 2x has a slight advantage for close in shots. The 2-7x scopes usually have a smaller profile, perhaps less likely to snag up in the brush. They can also be mounted lower to the rifle, which may or may not be an advantage. So for my type of hunting, go with the 2-7x. If you are likely to take distant shots more often, go with the 3-9x.

There are a lot of other things to consider, such as eye relief, field of view, reticule type, and of course, warranty.