I really don’t know into details. I read this when comparing the SBs and the PBs. That the PBs would have more roar but because they’re not closed like the SBs, they wouldn’t have so much control (hence the stopping power). Which IMO makes sense as the ported ones will have air escaping the conducts pressurising better but at the cost of not being as controlled.
But then again, no experience here. Just trying to figure out what to buy.