Traditional marketing and most PR moves from one campaign to the next. You plan, implement, await results, adjust and then start over again. Traditional approaches are like a milk train chugging from point to point, stopping at all stations along the way. It is slow and steady and with with a lot of stops and station masters along the way putting themselves between you and your customers.
On the other hand content marketing is like a hi-speed inter-city locomotive. You hop on and you're there for the journey. The crew and passengers are together until they safely reach their destination and during their travels get to understand and appreciate each other.
Related post: Content marketing: why now?