Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: During a temporary physical infirmity or an absence from the kingdom, the sovereign may temporarily delegate some of his or her functions to Counsellors of State, the monarch's spouse and the first four adults in the line of succession. The present Counsellors of State are: the Duke of Edinburgh, the Prince of Wales, the Duke of Cambridge, the Duke of Sussex and the Duke of York.

Question: Which title is more common among the Counsellors listed, Duke or Prince?
Duke