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sorry to be pedantic, but in terms of 'breathability', the eVent EPTFE (no 4 below) will be higher performing than the PU (no 4) of a Gabba-type fabric. These PU membrane fabrics are often married with regular knit non-laminate side/underarm panels to compensate for lower breathability performance. Advantages of PU laminates are high-stretch/recovery, great durability and (relatively) low price - and EPTFE are low/no stretch, need to be correctly cleaned/maintained, and will be in the upper price.
http://www.nemoequipment.com/pdfs/classroom/wbtechnologies_6-12-12.pdf
Oh do fuck off.
Good old eVent has served me fine for my commuting needs over the years. Even after years of use it can handle 30 min of the sort of rain that gets two droplets in the BBC forecast.
Doesn't have the breathability you get with the gabba type fabrics, but then again I never get up to high speeds on my commutes anyways.