I use variables for a different reason. Lots of field of view up close and I can shoot smaller groups when sighting in, which gives me more confidence. Notice I did not say ability
Also, Variables oft have a larger objective lens than a low X fixed power scope so at lower or medium of the dial powers really good exit pupils.
That said, I will defer to JB and Phil, My experience pales in comparison.
My favorie, though no longer made, is the Colorado built Burris Signature Safari 1.75-5 Posi Lock with thick post and crosshiar reticle. Love those scopes on the big boys.