-> They both are impolite. They both sound like a command/order. The first one is less rude than the second one. Could you please give us some context?

Is it polite to say could you please?

We also use 'could' to ask permission; it is more polite or formal than 'can'. Changing the word order to "could you please" is no more or less polite - it's a matter of style. whether requests starting with "Please can/could you..." render the same degree of politeness as those that start with "Could you please...".

Could you please vs Would you please?

But I would suppose that “would” is more polite, because it expresses the idea of probability, and of willingness, and of the desire that something be done, whereas “could” is more in the realm of ability (yes I can). And according to the American Heritage Dictionary, “would” is used to make a polite request.