Why RAW is better for printing.
1) More possibilities for image editing, ajust colors, etc.
2) More suitable for printing (A4+ format)
3) Huge scaling/cropping possibilities
4) Quality is equal to slide shooting, but much less DAC/ADC convertions. You don't have to scan your slides, so you won't less image sharpness.
Sure, if you prefer JPEG sources - no problem, but in this case you should forget about those advantages listed above. And remember, each edit/save cycle will reduce overall quality of the image because of JPEG data loss.
