Which / What is your most favorite sport ?

Hi everyone

I’m always confused about the usage of “which” and “what” in the sentences like this:

  1. What (Which ?) is your most favorite sport ?

  2. Which sport do you like (the ) best ?

  3. What sport do you like (the )best ?

  4. What (Which ) is your finest outfit ?

  5. Which (What ) outfit is your finest ?

Which one of the above is used most commonly ?

Thanks in advance.

Which - out of a selection

what - out of all the ones that exist,

Dear Beeesneees

Thank you for answering my question so simply but to the point !!

You are great !