What are the respective advantages and disadvantages of clientelism and functus officio? If there is an article on this subject provide a link, thank you.

Partisanship is the case trial to give the parties full opportunity to debate, so that the parties to the debate to promote the ascertainment of the facts of the case, in which the parties to the litigation to play an active role, and the judge only intermediary role in judgment. Ex officio refers to the proceedings to the judge as the leading, the whole case under the guidance of the judge to ascertain the facts, the status of the party is only in the position of evidence, is passive, and the judge can take the initiative to ascertain the facts ex officio, is active. Related articles are many, you can find books on jurisprudence and legal history books.