I think you always have a choice and that is the choice to be informed of both the pro's and con's on each option. If you do have to have a csection then make it yours; dont let yourself feel like you had no control.

I really dont see how its a decision that absolutely has to be made before birth day so do your research and then let the cards fall where they may. You could try a vaginal birth and end up with a csection. You could opt for the csection straight up. You could birth one twin vaginally and the other csection. Either way their coming out!