I own several styles- Beach, Cayman, Mary Jane, and Cleo. I haven't tried the Cleo at WDW yet, but have worn all the others, and here is my ranking:
1) Beach (Disney style)
2) Cayman
3) Mary Jane
The Beach got the best marks for a combination of cushioning in the sole and loose, non-rubbing, non-blister forming fit. I like the Caymans ALMOST as much as the Beach, but they are a slimmer fit and I noticed a slight bit of rubbing on the top of my instep after a full day of walking. The Mary Janes are the best looking IMO, but they have a thinner sole. I could tell a difference after a full day at the parks- I could really feel the pavement beneath my feet in the MJs and my feet were more tired and achy.
I'll be trying out the Cleo style on our next trip- I have high hopes for them. They seem really cushy and airy.
BTW- I highly recommend using BodyGlide with Crocs (or any shoes)- really cuts down on friction so you won't get "hot spots" and blisters.