As a general rule, use 'will' for affirmative and negative sentences about the future. Use 'will' for requests too. If you want to make an offer or suggestion with I/we, use 'shall' in the question form. For very formal statements, especially to describe obligations, use 'shall'.

Is it more shall or will Polite?

Shall indicated obligation or command, while will meant wish or want. It was deemed that the first person (I/we) should take will – as you can know what you wish but not what others do – while the second (you) and third person (he/she/it/they) would take shall – as you don't give yourself commands.

Shall vs Will UK?

The general rule is that in the English spoken in England, the future is expressed in the first person by the use of the word "shall", and in the second and third persons by the word "will".