I was at a local shop that works almost strictly of Ford Power Stroke engines. They showed me various cut open fuel filters for the Ford Diesels. Only the Ford filter had a waterproof membrane in it to stop the water. All the rest of them appeared to have adequate filter media, but none of them had Ford's water membrane.
I often use aftermarket items because I think a lot of them are better than the OEM trying to pinch a few pennies - in this case, I'm staying with the Ford fuel filters.
Bill