the quick answer to the guts of Bosch v. WIX is to look at their admittedly propaganda laden websites. My work web browser is not supported on the bosch site but going here should show you their filter breakdown. The WIX site has their exploded filter and the thing that strikes me the most (when compared with CNNs photo of a dissected bosch) is bosch's flimsy spring and bypass valve. WIX uses a coil spring which holds even pressure. The bypass valve on a WIX is also in the front of the filter so that if it is used, it does not wash the contaminants out of the filter media and back into the engine. So, in these 2 ways, I find the EIX superior. Again, as I noted in an earlier post, any of these aftermarket filters is better than OEM so I'm sure the Bosch v. WIX debate is more intellectual than pragmatic.
NOTE: I think I'm coming off as banging the WIX drum loudly and I probably am. I like them and have dissected a few filters to conclude (without scientific measurement or using the scientific method at any step) that Wix has a superior product that was designed better than their competition. That is purely my opinion and I could be wrong. I have no affiliation with WIX or any other automotive part manufacturer and ultimately I'm not invested in the brand of filter you install. I'm just sharing my findings and opinion. Sorry if I'm coming off too strongly. I'm used to much more active forums with thousands of members so I apologize if I'm perceived as hyjacking this thread.