The first one is from VIVmag. It might look neat, but it would cost too much to make. I hate it, actually. It reminds me of the design of certain DVD menus which waste time with fancy graphics.
My answer for which is the best? None of them. I don't see any that adapt well to an iPhone screen. All of these prototypes assume a large tablet with touchscreen. I've had several, and I think they're just too awkward to be pulled out whenever I want to glance through a magazine. I don' think any concept will succeed without a mobile option.