The main advantage to PBS is user flexibility. It allows for more lines to be created that match the individual needs of each pilot.

As far as trip touch conflicts and vacation, that isn't a fault of PBS, that is a function of your CBA/PWA language that governs the system. Many blame PBS but in reality is bad contract language regarding the credit for Vacation/training/etc and language of how the trips are run.

I've been on SWA jumpseats where they have bemoaned PBS, and I always raised an eyebrow since there are far more productive things (Section 1) that need to be paid attention to in a contract.