Gisele's cover, BY FAR.
Tanya's cover is lovely as well, even though her cover and Gisele's cover look very similar to each other. In fact, IMO, they're the only two covers that look like covers from an actual fashion magazine. The other covers look like the models are contestants from a show like ANTM wanting to be models.
Btw, this was the first picture I've seen where I can honestly say Tanya looks great.
What I didn't like about these Vogue Nippon covers is that there was too much repetition with the models. I would've liked to have seen some different models.