I usually buy Champ filters these days because both the XL and the standard filter are really cheap at rock auto. I add them when I'm buying other parts. No issues ever, as far as I know (I don't cut open the filters, obsession has not reached that level..yet)
I usually do spring for Motorcraft FL500S for my Mustang and Mann W811/80 lately for the Hyundai Elantra GT. I was buying Hyundai OEM but I noticed that the Mann filter is very similar and cheaper - it's a spare car these days. I've used Champ XL in those applications though, with no issues or concerns.
Recently got a Purolator Boss and a couple Fram "Force" filters (seem to be tough guards) from our local Carquest, on a deep sale. I'm much more particular about OEM or OEM supplier air filters than I am about oil filters.
So TLDR Champ, but not exclusively.