I prefer the Fitflops ones, although I cannot wear any toe posts as they kill my toes.
The dune ones look uncomfortable.
I have found that as I have got older, I need some sort of support for shoes, so like a t-bar, or a slingback. When I look at the Dune ones, it just reminds me of the dragging shoe sound when someone doesn't pick up their feet properly to walk. I am slim of foot though, so that might be wear I would never be able to wear a pair of these.
So I vote number 1 as they look the most supportive. And yes, now I am showing my age.........