I had an assingment not to long ago with this same question.
Pros: You were entitled or eligible for a good education; could rise in the church and become very comfortable or even rich; could preach the gospel and help people; were respected in the community and sometimes advised kings, queens, nobles and others.
Cons: You were not allowed to get married; you had superiors unless you became pope; you did not always get the job you wanted; in some places, the church was corrupt.