If you're considering running either on the street, does it really matter ?
It would be fair to assume that neither are gonna sound quiet ...at all.
If this is for a bet , I guess the PBRs will growl a bit more but this type of comparison depends on many many variables (tread wear , psi, tarmac type, temp , if you have screwed ice racing cleats into the lugs ,etc)
A good few years back, JP magazine did a comparison of many MTs and noise level was one of the testing results ...Google .....
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