Quote Originally Posted by SadieKate
2 things: the platform on the Candies give you a more stable platform if you need to ride unclipped for a section of trail and it also provides a bigger platform in general for those who prefer more support under their feet (for instance, if you don't use a stiff-soled shoe).

Someone riding XC trails might be fine with Eggbeaters and someone riding mostly downhill might want the Candies, but it really is personal preference.
Note the Eggbeaters and Candies can be used for road as well.