That way, you still have the RAW file for future use. The RAW file contains much more information than a jpg, and will give you more flexibility should you decide to go back and edit them.
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I also think it would be nice to have the RAW due to the fact that the Bride/Groom are going to pick out a few very spceific shots for printing (like a larger version of one shot that will get framed and things like that). It would be a very good thing to have a high quality file to play with for those particular photos. No post editing every shot, but have the files needed to edit/modify special ones.