If a camera has an option for RAW then I will always choose that. My workflow is one that is now totally based on the use of Lr, although in certain situations I will also use ACR to process an image that is not part of my image collection. For example I'll use ACR instead of Lr when working on others sample images for POTN posts.
With Canon cameras I see no point in saving a JPEG image alongside the CR2, If you need an out of Camera JPEG DPP will chuck those out without any work needing to be done, Since DPP defaults to using the in camera settings for it's conversion, and IIRC you can even get them resized as an part of the process.
For the person wanting "Canon" Sepia conversion shooting RAW, with your in camera settings set for what you want as a DPP default, but you still have all the original sensor data, and all you need to is open it in your RAW software of choice for a different conversion. You could even quite easily change the Picture Style in DPP for a very simple change to a different set of processing.
It is this simple ease with which you can swap around your intent and change the whole conversion that keeps me shooting RAW. Since I can't change my mind about an image that I shot as a JPEG in monochrome, and convert it back to colour.
Alan