I see your point, but there are a couple issues with that. What you want to accomplish is fine, but first off, we don't want to step on sponsors' toes. Secondly, things change, and sometimes very rapidly and fluidly. Look at the M1 0w-40 issue as it stands now; not only do formulations change (including swings in base stocks), but specifications met change, too.
Further, as you well know, it's really difficult to name something as "best" of a category when there are very different, yet equally correct, ways to consider a product as "best." Some fixate on Noack, others on one of several additive levels, others on cost, and others ensuring that the most number of specs are met, even for a basic API oil.
So, which is better between Valvoline VR-1 10w-30 and VWB 10w-30? VR-1 is cheaper at regular price up here (believe it or not). It has more zinc. VWB rolls back frequently and is in a better jug size. It also meets specifications and is a great SN/GF-5 oil, functionally interchangeable with other oils of the same specification and grade.
Of course, it only gets more complex if we start to figure out which is the "best" of the ILSAC PCMOs, let alone synthetics, no matter how one defines that term. I would suggest you would have a great deal of hand wringing if you were to even try to list examples of a conventional and a synthetic and a Euro synthetic. The base stock arguments still occur, and we don't always know what's in an oil anyhow. Also, what is a good example of a European synthetic, if I asked for an example? Which would be a better example between Castrol Edge 5w-30 A3/B4 and Castrol Edge 5w-30 C2?
I love the concept. But, the execution will, at the very least, create a fanboy war.