One of the things they did not test is what the flow and pressure does as the filter gets dirty. I would GUESS the 10 micron would clog up faster reducing flow.
But that is just a guess
Most engine wear is caused by particles between 5 and 10 microns in size.
I do hate the tiny filters used on new vehicles and the "partsman" has no clue or interest in finding a larger one. For the small block Chevys you could get the medium/heavy duty truck filter and put it on your small block. Hung down almost as far as the oil.pan.
