From a design perspective I find this the most sophisticated one (please note that the one at the top left is just the explanation of the idea behind the icon, so the icon would look like the one at the bottom right).
When you look at many brand icons, like the Toyota logo, they have hidden meanings and some use negative space to convey something. see
It is simple, still recognizable, and smart. The designer put a lot of thought in it. It expresses what this project is about: Innovation, functionality, and to the point. (see what I did there? point as in the point in the logo?)