I just fought with my mother in law. I am fed up of living with her and i will be asking my husband to choose between me or her. But I am scared he will choose her. Any strategy on how to ensure I get my way.

There isn't any. Put through to ur husband what u are feeling and see if there's any way to stay separately. Trying to manipulate him into choosing u will just make u out to be a scheming person and that may backfire in the end.