I would think that would be dependent on your room ... what works BEST for you????
How much sunlight comes into your room? How much privacy you want in the room?
For me ... I get very little direct sunlight in my sewing room, so when I am there, I throw open the curtains on the patio door and windows, so it can be open and bright and so that I can enjoy the view! When I am not there, they are shut to keep any outside eyes from peering in. (and that's not a problem, just a precaution!)