The top one I feel like you can wear it with more things like dresses and skirts. The bottom ones are a little more edgy. It depends on your style if you wear slit of jeans I say go with the bottom . If you want something a little more versatile go with the top. They are both gorgeous shoes but there's just more that's going on with the bottom one. Hope that helps
If you have both shoes (because you are asking which one to keep), would you perhaps care to do mod pics? I was thinking that maybe there is some deciding factor for one of them on *you*
Judging from shoe alone, I find the Viennana more "classy" (and yes, mary-janeish) and the Vortik more edgy (jeans, leather, more contemporary).
Aesthetically I prefer Viennana, but if I decided to buy a multi-strap style I would go with the edgier look, because otherwise it would be like craving ice cream but buying no-fat/no-sugar/no-milk substitute.