The first one (1) is more polite. You are asking the person their opinion and taking them into consideration. Whereas in 2 you are telling them what you want which can be deemed as rude. If the person senses English isn't your first language they will most likely understand that you aren't trying to be rude.

The first one is more polite, but that's because the sentences mean different things. In the first one, the speaker is asking if the listener wants anything; whilst in the second one the speaker is declaring that they want the listener to do something.

i prefer the 1st one "would" , "may" and please are usually polite words