You should use both, or know how to use both. I don't know of anyone that uses an open bridge 100% of the time and visa versa. Use what ever bridge feels comfortable for each shot. If you get down on a shot, and the bridge feels wrong, don't switch whilst you're down. Get back up and start again. Soon enough you won't have to think about what bridge you are going to use, it will just come naturally with no concious decision.
Regards