I sometimes wonder if it really matters at all. My dad has always used the cheapest filters he can buy, he still has some old K-Mart branded filters on the shelf. he now uses walmart brand and seems to not have any issues. his 77 got over 450,000 on it before the frame rotted out and his 94 now has over 270,000 and still going strong (second trans due to hauling a lot with it) and several others He has had all get the oil changed every 7,000 miles or so if they need it or not
. but I personally have this mindset that you need a name brand filter or your engine will die
I will probably use Wix until I am out of them (bought a few for the shelf) then I will probably switch to puralator.