The flueroastamer band is soft and very durable/comfortable. They clean up easy and can get wet. However, in the heat, they stick to your skin.
The nylon bands are lightweight, very comfortable, durable. However, if they get wet, they retain water and need to dry out. Some have said the nylon can chafe your skin if used for exercise.
I have both the flueroastemer and nylon bands. They both are great in there own respects.