I bought the kind with the fabric that goes around the ankle. The soles are at and hard and weird, and exhaust my feet.
DS got the squishy yoga mat ones, and they are seriously comfy. I "stole" them and wore them at wdw when I was there for Wine&Dine, and they were comfy on the bottoms of my feet but the part above the foot gave me blisters. Gotta break your feet in to them before wearing them long days (especially pre-long run).