Which is better between going to general graduate school for phd or professional schools?

i have bachelors in communication and going to graduate school but im conflicting between applying for mba/law school, or general graduate school for phd in my major. how long do they take usually? to obtain phd in my major, it will take up to 6-9 years. I dont think it’s worth the years. please advise.
To Kalos: oh i apologize for my poor writing. anyhow try to focus on the content if u are able to understand.