Towards the end of the article is this bit of research comparing the safety of breech birth and cesarean.
The most common emergency situation is with so-called breech births—where the baby has its bottom facing the birth canal rather than being head downwards. In the days before anesthesia and surgery, all manner of complex devices were invented to extract the baby from this difficult position—one that is potentially dangerous to both the mother and infant. Some doctors have also attempted to solve the problem by developing techniques of turning the baby in the womb from the outside. More recently, the trend in these cases has been to perform a CS rather than risk a natural delivery.