I did not specify whether the preference would be conscious or unconscious, and I disagree that me running the A/B test myself instead of asking if anyone else already knows the answer to the question already (maybe by having run experiments themselves) is the only way to be sure (well, OK, it is always the case that people I am targeting might be different than other people already studied, but at that point there is no longer any value in trying to learn things as a species at all, which is a pointless precision).
