At the risk of starting another war of words with a particular poster by writing this, it looks to me, based upon the PDSs of the two oils as well as the posted UOAs that PYB is the stronger oil of the two.
Now, on 4-5K drains, I'd expect maybe lower wear metals from VWB, but stronger TBN retention with PYB.
Which oil cleans better?
Who really knows?
I'd be inclined to say PYB, but Valvoline oils do seem to produce very good results on moderate drain intervals.
I have Valvoline oils in two cars at the moment, so I must think they're pretty good.
I've run PYB in the past, and thought it seemed very smooth and quiet, but then Valvoline does too.
These are quite different oils with entirely different add packs, but both seem to work well in service.
Maybe the answer is buy whichever is cheaper?