I also think the 710 would be a better fit for someone with a tall and slender body, particularly those with slimmer thighs. On the other hand, the 712 appears to be designed for people who require more room at the thighs. Personally, I prefer the fit of the 712 as it offers more space for my thighs. But it only comes with zipper so I decided to go with the 710 instead.