Some other filter manufacturers offer and recommend a 5-micron filter element. Why doesn’t DW? Which is better?

Per the Bosch Automotive Handbook (9th edition 2014) “The required filter fineness is dependent on the fuel-injection system.  For systems with manifold injection, the filter element has a mean pore size of approximately 10-microns.  Finer filtering is required for gasoline-direct injection. The mean pore width here is in the range of 5-microns”.  The vast majority of high performance fuel systems utilize manifold injection and therefore, a 10-micron filter element is appropriate.

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