If you are referring to the Fram Extra Guard for $3.77, I would prefer it over the NAPA Silver for the following reason(s):
1. The Fram Extra Guard has a dome end bypass valve and it is independent from the ADBV in some/most cases.
2. The NAPA Silver has a combo valve. Some folks take issue with the nitrile combo valves. Again for some/most cases.
3. The Fram Extra Guard efficiency is better. 95% @ 20 micron.
4. Rare to see a bad cut & post of either filter even when seriously abused.
5. Still can't decide, flip a coin.