My 14-45mm, by far. I've used the 40-150mm a few times, but I do a lot of close-up work, and practically everything I do is hand-held. The 14-45mm is probably my most versatile lens, and I find I can get the right distance with it for some of my shots.
Which isn't to say there haven't been times I've wished I had the other lens, but for now ... the 14-45mm does the trick :
