RAW is a bit more of a pain to process because in most cases you need to do some amount of conversion, and the file sizes are so much bigger.
RAW will undoubtedly give you clearer images but the degree to which you notice that would vary.
I used to image in JPG until I got the hang of the DSRL imaging and then moved on to RAW. I now only use RAW, really just because I know it's best and so I have the best chance of getting a good result. I was never particularly dissatisfied with my JPG results due to the JPG usage but the RAW is that bit crisper.
A large benefit of RAW is the use of dark frame subtraction is much more accurate. I would expect JPG compression would tend to negate the usefulness of dark frames because the low level noise in the background might be "compressed out" by the JPG format, meaning a subtracting of a dark frame would remove some noise and introduce some more of it's own (the subtraction would not be a perfect match).
My 2c worth.
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