I like the trim sheets, myself. You can position them where you want them as described above, seal the edges with a trim iron, and be as creative as you want. My biggest plus with them are the many unique colors available, and you don't have the expense of whole rolls on the stuff to have a really varied trim color scheme.
Be sure you don't miss the extra sealing at the leading edges of the trim, though, or they'll eventually try to peel back after a couple of years of goop exposure. (Yah, yah, I hear you electric guys out there - no goop.)