Drew is right on the money here. I like the flush trim bits better because of the bearing location. It is a bunch safer in a handheld router than a pattern bit, because you are not hanging out excess bit below the workpiece. With appropriate amounts of caution either bit will work just dandy.
<norm> Actually boys and girls, the router is an extremely dangerous tool if not given the proper respect. Safety glasses, no loose clothing, watch the long hair, etc. The razor sharp carbide bit is spinning at about 20k RPM. Please be careful. </norm>