12:14 have you had your baby yet? Were you as happy with prenatal as in the delivery room? That is where practice philosophy really matters.
In terms of general differences between the practices, the midwives are committed to unmedicated vaginal birth wherever humanly possible. Some think, regardless of whether it could be done more easily or comfortably with some interventions. If that is what you want, go with them. If you aren't morally/philosophically opposed to intervention and would just prefer an unmedicated birth, go with the OBs.