I'm on automatic pilot. It's not really a conscious decision for me. It's more like whatever feels the most comfortable for the shot at hand. I know I should probably be more consistent, but it's way down on the list of things I need to be more consistent about, lol.
This applies to me, completely.
I think i use open probably 80% of the time, give or take. Closed for draw, like many others have said. Also closed for breaking...