What is difference between Harp and fan designs of cable stayed bridge?

In harp type cable stayed bridges the cables running from the deck to the tower run parallel or near parallel and attach to different points on the tower, in fan type bridges the cables all run back to the same point near the top of the tower.

The fan type bridges have less horizontal loading on the deck so a lighter and less stiff deck structure is possible but presumably you need a stronger and higher tower, or at least able to support more vertical load high up (not sure I'm not an engineer I just like the aesthetics of these structures!)