Anti-foam and anti-oxidation are both very important, but they are just so dang easy to incorporate into the formula, it didn't require any effort with regard to formulation. The shear, friction, and wear resistance is where you might see differences from brand to brand.
As
@KrisZ mentioned, the wear resistance is nice, but the parts that experience are meant to be changed out anyway. So you may see longer life of those parts with a better formulated product.
Friction and "stiction" you might feel a difference, most probably won't though.
Shear stability is one that will almost definitely vary from high quality to low quality products. Formulating in shear stability costs $$$. No way around it.