Thirsties Duo vs. Regular Wrap

I posted this question in my thread about motherease alternatives, but then thought it should probably have it's own thread, in case someone else is wondering the same thing.

Is there any other difference between the thirsties duo wrap and the thirsties regular wrap besides the option to snap down the front on the duo?

I have both types. There's no obvious difference that i can see. I prefer the sized wraps to the duo as i nipped Sophie's leg with a popper this morning. I felt awful