I have tried Niles, Cayman's, Beach style, and Athens flip-flop style! My least favorite was the Athen's flip-flop. The footbed was awesome (very comfortable) but I hate anything between my toes and even this soft foamy shoe drove me crazy! I sent them back to the store I bought them at! If you don't mind the thingie between the toes, it would be a terrific shoe though! My next least favorite is probably the Niles. They are comfortable, but not as much so as the Cayman's and Beach style. The Niles are narrower (but I normally wear a narrow shoe) and while they fit my foot nicely, they are not loose like a traditional Croc is supposed to be and therefore create a higher risk of blisters due to friction of skin against foam. I also have grown to like the look of the Cayman and Beach Style so the Niles look a bit "blah" to my Croc-infested eyes! Now, between the Cayman's and the Beach Style, I prefer the Beach Style. I have just had better luck getting the Beach Style to fit me properly. I normally wear a 9 1/2 narrow in a non-Croc shoe. In the Beach Crocs I initially tried a size L (women's 10/11). They were monstrous! Almost room for both feet in one shoe! Then I tried the medium (women's 8/9) and they felt great except my second toe was touching the tip of the shoe. I tried putting the shoes in the dryer for a few minutes and then wearing them over thick socks while they cooled off (also just a few minutes). Then I had a perfect fitting Croc! The Cayman's I ordered initially in a size 10 and again, they were HUGE! I reordered a size 9 and did my dryer trick and they fit pretty good now, but not as good as my Beach style! I have 9 pairs of Crocs (not counting the several pairs I returned) and the best fitting and most comfortable are my Beach style Crocs! But, to answer the original question, "Niles vs Caymans"? I would say I prefer Caymans! But overall the Beach style is my absolute favorite!