Picking the correct Rendering Intent for soft proofing and printing isn’t difficult if you remember these two points:
1. If you care most about maintaining the color relationships in the picture, use Perceptual.
2. If you care most about maintaining the tonal relationships (dark-light), use Relative Colorimetric.
Important Note: if you are using custom printer profiles, you should use separate profiles for Perceptual and Relative Colorimetric rendering intents.