What is more polite would you please or could you please?

Both "would you please" and "could you please" are polite requests, but "would you please" is often considered slightly more polite or formal. "Would" implies a willingness to act, emphasizing the speaker's respect for the listener's choice. "Could" suggests capability, which can also be polite, but may sound a bit less formal in some contexts. Ultimately, the choice often depends on the situation and personal preference.