It is really up to the sailor. If you can not muster enough boats of one design, then open class is an alternative. In handicapped racing, you have to wait for the computer to tell you who won. Also, this relys on a rating system to correctly score each boat. IMHO, much more fun to race the same boat, and know the results right away. In our Hobie 17 races, quite often the boats finish less than a boat length apart.
Now to switch to more exciting results, check out the photo's from Melbourne at
http://gallery.sailmelbourne.com.au/smgallery/album68?page=4(my favorites are on page 4)
One Design Racing in action, also check out the close results.
Caleb Tarleton