"What it means is that some of Charles' press secretaries have been better than others as some of the Queen's press secretaries have been better than others"

This quote by Anthony Holden is describing the effectiveness of press secretaries for both Charles and the Queen. It implies that some press secretaries have been more successful than others in their functions. This could be due to a range of aspects, such as the press secretary's experience, their ability to interact successfully, or their ability to manage tight spots. It likewise recommends that the Queen and Charles have different requirements for their press secretaries, which the Queen may have higher expectations than Charles. Ultimately, this quote is highlighting the value of having a proficient press secretary in order to ensure that the public is accurately notified about the activities of the monarchy.