I guess this comes down to an Aperture question and a more general post-processing question.
I've been shooting RAW+JPEG and importing both to Aperture with the RAW image set as the master. But I've noticed that in low-light or high-contrast photos, if I switch the JPEG to master the photo "looks better".
Why does the version I set as master affect the appearance of the photo in my library in Aperture (where does the other one go exactly)?
And why does the RAW image seem to look worse in these situations? How can I figure out approximately what the camera did for the JPEG so that I can best process the RAW image?