Kind of like how oil recommendations and “proof of efficacy” are gleaned from $30 spectrographic analyses and typical-value PDS.most of the info gleaned from this forum revolves around the looks of the filter. For myself, after spending 40+ year working in a fleet where whatever low bid or whatever is cheapest is the rule, I stick by that method too.
I will admit when I was younger and less experienced I actually thought branding and marketing claims etc made a difference but I don't anymore.