RAW is my go-to format for most photo shoots. However, when photographing high-speed subjects, I find JPEG is actually preferable. Here's why:
Most camera buffers fill too quickly with the large RAW files sizes. This forces you to wait until it clears so you can continue taking photos. The process takes a few seconds which is enough time to miss the peak of action.
In JPEG mode, this is not an issue as the file size isn't as large and can be written to the memory card much faster. If you opt for JPEG, just be sure to keep the quality to LARGE/FINE and you will enjoy a big buffer along with outstanding image quality.