As for me we chose kkh because if any medical emergencies were to crop up for either the mother or baby kkh is the best place to be in. The kk midwife also told me that if the private hospitals are unable to deal with the emergency they will you back to kkh but at private rates. Ie one of my friends is a diabetic when she conceived, her gynae didn't even want to attend to her but told her to go kk straightaway.
Another friend has lupus and also goes to kk for her prenatal checkups cos private gynaes tend not to handle complicated cases, they are in it for money..
Although at the kk the private suite (tps) I pay even more than what most mummies pay for private gynaes as the consultation charges are higher and there is no package available, so we normally pay around 140 each time for consultation, scan and tests etc. Can amount to quite a sum.
Think if you see the doctors at clinic A/B etc its cheaper.. Mostly the same docs anyway just that they run diff clinics on different days.