I go both ways! For me, I will let the dream take control when I don't have a set goal or I'm not fully lucid and forget I can get rid of most of the dream's control. I'm pretty sure a lot of people are like this too. However, I know some dreamers like to let the dream take control. Sometimes doing this, the dream can send a 'message' you don't get as much when you take complete control. Usually, though, I try to take control because sometimes when I wake up after letting a dream take control, I regret it because I had a goal that I was looking foreword to accomplishing.