Hi Fulufhelo,
I can save you a lot of time since I have done my homework on this recently.
Although there are gyneas that are pro-natural or willing to allow you to have a normal delivery (Like DR. Maria Davis) I am not so sure that Unitas is such a great hospital if you are planning a "very natural" birth. In my opnion Unitas hospital and staff still functions with a strong medical approach which is quite different from Femina or Genesis clinic for example.
I do believe your caretakers and hospital environment will to a certain extent determine the type of birth that you will have and if you plan to do a natural birth with minimal interventions I would recommend you find people who will support you 100% all the way in this.
I am currently with Dr. Swart at Femina hospital and was really happy with him and he answered all my silly questions with such patience. However if you do use him, you will be using the Femina hospital staff and not Midwives exlusive birthing facility. To use the Midwives birthing facility (amazing!!) you must use the midwives from there and there recommended backup doctors (Dr. Swart is not one of them).
Perhaps have a tour of the hospital and the birthing facility (Midwives exclusive) and then decide.
PS: I am driving through from Centurion to Femina - about a 25 min trip.