There isn't an oil filter comparison site out there that has anything useful to share as far as I'm concerned.
No testing is done.
Is appearance the way we determine the effectiveness of anything else?
Engine manufacturers set specifications filters must meet. Testing, (via consistent methods by trained individuals), is done to ensure those standards are met. None of the oil filter comparison sites test anything.
In addition to NOT testing anything, many of the oil filter comparison sites include disclaimers such as, "I'll begin by saying I have no background in this field..."
It's kind of funny really. If the SAE themselves authored a site where individual filters' passing test scores and such were listed, I'll betcha the other "oil filter comparison" sites would still get more hits and be linked to more often.

No testing is done.
Is appearance the way we determine the effectiveness of anything else?
Engine manufacturers set specifications filters must meet. Testing, (via consistent methods by trained individuals), is done to ensure those standards are met. None of the oil filter comparison sites test anything.
In addition to NOT testing anything, many of the oil filter comparison sites include disclaimers such as, "I'll begin by saying I have no background in this field..."
It's kind of funny really. If the SAE themselves authored a site where individual filters' passing test scores and such were listed, I'll betcha the other "oil filter comparison" sites would still get more hits and be linked to more often.