Don't know if anyone has done this poll before but when u take a photo, which would be your primary concern? I know both are important but you will only be able to control both well through lots of experience.
As for myself, i always try to compose and then check that the settings are right before I hit the button. But sometimes this means I can lose the shot in the blink of an eye. *sigh* still an amateur.
I would like to add that this applies in the context of what you would consider a good shot.