Ive always considered STP to be their store brand. I don't see them anywhere else
I'd consider that to be true. They are basically the same filters used by Wally TLE's and Firestone auto service shops, a Champ made jobber type filter, some ecores. Difficult to get much lower tier than that.
I can't recall seeing any VC filters in my local AZ's recently and as said, no VC's listed for my applications.