We had both and after the first week we used the bouncer exclusively. The bouncer is more easily transported and put the baby to sleep just as easily as the swing.
I've been asked to photograph a wedding for a friend. I've done portraits and flowers. But never a wedding. I currently have a Nikon D80 (b/c everyone I knew had huge probs with their D90) and the 18-55, 55-200, 1.8 50mm. If I do it - I know I'll purchase an extra flash. Maybe the SB-400...