Note that the Fleet Filter comparison even has a typo. Its chart claims the Wix uses a leaf spring and the Napa Gold uses a coil spring. Yet, the text says they both use a coil spring and the pictures clearly show coil springs for both filters.
Plain, simple Garak.
2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 51358
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515