While I have never cut open a filter, I get the best flow with Proselect. My oil pressure holds solid and steady too, about 80 psi at cold idle and about 65 to 70 psi at 2000 RPM and 70 MPH when cruising on the interstate. That's plenty good enough for me. I change my oil at 3000 miles so I doubt the filter is on the engine long enough to cause any problem with the media breaking down.
The Proselects I buy for my truck and my gf's car both say Gastonia, NC on the box. The Carquest Red filters in my stash say right on the side of the filter, "Made in USA" "Affinia, Gastonia NC". That is also plenty good enough for me.
Napa and Carquest would not put their good name on an inferior or low quality filter. A lot of garages use the Proselect and CQ Red filters and Napa or CQ brand oil too, and I doubt they would risk their reputations on a bad filter or low quality oil.
Proselects, CQ Reds, Napa and CQ brand oil all work fine for me, and thousands of others too.