I've paddled both a Prism and a Magic.  

I found the Prism to be very fast but a pain to turn and very hard to keep straight in a rear quartering wind.  The Prism has no rocker which allows for good tracking but sacrifices turning ability.

The Magic on the other hand has a rocker and is therefore much easier to turn.  I have had much less trouble paddling a Magic in the wind.

I have since purchased a Magic and love it.  

Plus Bells are much better looking than Wenonahs!   ;)