I like my California shutters because I can adjust the louvers to allow as much or as little light as I want, or change the angle so the light comes in but doesn't shine directly on my face, or on a dull day, I can swing the entire shutter set open to allow all the light in. Best of both worlds for me. The other posters have all made good points too, it's important to figure out what you need.
Good luck!
GEMRM