Hasn't been determined. R&P is a new technology where as HPL is using the traditional high solvency/detergent way which is proven. If you're using HPL you shouldn't have any carbon ring build up.
R&P is also limited in terms of viscosity grades. It's also not as long drain capable as HPL.
R&P has a unique chemistry that even impressed Dr. Warholic who worked for Infineum for over 16 years.
Cleaning piston deposits is not an easy task. Valvoline had to really make an oil with substantial group V (50%) for it to be able to remove piston deposits. Cleaning sludge and other carbon is not the same as piston deposits, something that most get wrong.
You'd have to run a test and tear down the engine and look at pistons, which no one is going to do.
Valvoline does give you this:
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