So, there was no "first source of uncertainty", and you had the advantage of real-world observation and photos put together. Neat. Indeed, given the apparent

So, there was no "first source of uncertainty", and you had the advantage of real-world observation and photos put together. Neat. Indeed, given the apparent massive evidence in favour of NEW, you probably didn't need to twist your brain further. Now, if we're doing A/B testing on a commercial web site, I think we should use every scrap of information available to us, and go into full Bayesian mode if at all possible: if of A and B, one is worse, you don't want to make one too many test before you figure this out. The sooner you positively know which is best, the better.