MicroLite XP vs. Pertex Quantum bag materials?

MicroLite XP is supposedly a bit more durable material and water resistant than Pertex Quantum as a an outer shell in a sleeping bag. Assuming both materials are treated with a DWP. How much more moisture resistant would the Pertex Quantum be?

Under real world conditions such as heavy fog, cool humid night air would there be any real benefit of one fabric over the other?

Microfiber is more water and wind resistant due to it's tight weave. It is naturally more resistant to feathers poking through for the same reason. Pertex also has a tight weave but not as tight as Microfiber and it's also a thinner fabric therefore it will leak feathers and be less water resistant. Under real world conditions, both shells will do well due to their DWR but if it wears out under heavy dew or moisture then Pertex will leak faster than Microfiber.

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