One pore size is not better than the other. Different micron ratings are required to protect different fuel components. As a rule of thumb: 100-micron for fuel pumps, 40-micron for carburetors, 10-micron for manifold injectors, and 5 micron for direct injectors.
The DW in-line filters are available in 3 canister sizes. Larger canister sizes provide less flow restriction and increased service intervals. Small canister sizes provide a more compact installation. Flow restriction data is available on the product tech pages.
A properly designed port manifold fuel filtration system is comprised of staged filters. A 100 micron filter element should be installed between the tank and the pump and a 10 micron filter element should be installed between the pump and the injectors.