This question already has an answer here:
To create a shape like the one in the image below, which option would you use and why?
As you can see option "A" only uses anchor points at the peaks and then uses broken handles to achieve the curve in between points. Option "B" also uses anchor points at each peak but with no handles, so an extra anchor point with handles is needed in the middle to achieve the curve.
Personally I have found that option B is the faster technique even though it requires more anchor points. Option A requires a lot of finessing of the handles to get the curves just right. But which option would you use?