I went through the parallax arguments last year with my Savage Mark II .22LR rifle. At that time I did some experimenting with three inexpensive scopes. Two of them are factory set for parallax free at 100 yards. One is a Bushnell Banner 3x-9x 40 rifle scope, and the other is a Tasco Pronghorn 2.5x 32 rifle scope. They previously have set on top of various deer guns. Both of them are minute-of-squirrel accurate on a rimfire rifle out to 75 yards.
However, the Tasco Pronghorn 2.5x deer scope will not allow consistent groups better than 3/4" at 25 yards. But Bushnell Banner scope will group with holes touching at 25 yards, but only when set on 3x to 4x. Otherwise, I cannot manage to get the sight picture to settle in, due to the parallax problem.
On the other hand, I have a third scope which has proved very consistent on my Savage. It is a shotgun scope which is set for parallax-free at 50 yards. (I think it's a Bushnell, but it's out in the safe and I don't want to run out there right now.) Although it is only 2.5x magnification, I can routinely manage five-shot groups of less than 1/2" (and often holes-touching) at 25 yards, and quarter-sized groups at 50 yards.
Here's what I discovered. I could actually see the difference between the 50 yard and the 100 yard parallax-free scopes by moving my head slightly one way oranother while looking through these scopes at a 25 yard or 50 yard target. By squeezing off shots while my head was ever-so-slightly out of position, I found that my points of impact with the 100-parallax scopes were off as much as 1 1/2" at 50 yards, and as much as an inch at 25 yards. That may be okay for squirrel shots (or maybe not), but it is definitely NOT good enough for scoring points on a bullseye target.
My vote is for a scope with a parallax-free setting of 50 yards. I believe it will take one variable off the table in the search for accuracy. I don't believe there is a great enough price difference between a 50-parallax scope and a 100-parallax scope. With careful shopping, there may be no price difference at all. But I could be wrong about that, as I tend to buy scopes on the lower end, pricewise. Some of the high-end scopes may have significant price differences.
Good luck.