I think these two polls will not work out, though I understand the intention. If the results show that more people are having the cast issues with Leaf than with Phase, it may just be telling us that more architecture shooters are buying the Leaf product than the Phase product.
Also, when I work with a Phase back, at least twice a month, I see Lens Cast and correct it as part of the C1 Pro workflow. It is not seen as a defect any more than reciprocity was with film. When I work with my Aptus 75 and have to run a software correction to remove the centerfold, I see it as a defect. Both files are fixed perfectly. I believe this kind of nuance in perception will skew the results too far to be of good use.