Is the A7WS what is refered to around here as the 'big-ass shure' (B.A.S.)?
I've not come across a comparison between various foam screens, although some manufacturers list test figures for rumble reduction and also frequency attenuation at something like 15kHz. Since the primary negative of foam screens is attenuated highs, I suspect the prefered screens will be dependant on the response of the microphone. I use the B.A.S. on the MG M94s which have a pretty strong diffuse-field type peak up top- it's sort of like EQing that down to a flatter response curve.
I did come across an interesting paper years ago by Jorge Wuttke and posted about it at TS before in another windscreen tread a few years back, probably with a link to the paper. If I can find it again I'll post a link here. In it he discusses wind protection, how and why various approaches work, their problems and advantages, etc. His conclusions as I recall were more generic than what you are probably looking for, suggesting the superiority of foam over basket-style screens in sonic terms (mostly due to the isotropic nature of the foam creating no internal reflections from a supporting basket or outer cover), as long as the wind rumble reduction of the foam screen is sufficient to stop the wind noise.
It was intersting to learn that besides attenuating highs (which he says is more or less completely and transparently reversible with an inverse EQ boost), foam screens actually change the polar pattern of directional mics somewhat by reducing the velocity component of the sound waves reaching the capsule. That doesn't effect true single-diaphram pressure omnis of course.