The text is an appeal to logos because it explains logically why upgrading to Vista makes little sense when you could just get a mac, which is implicitly more advances, upgrade past it, and also said to be simpler, more powerful and a lot more fun.
The image on the left builds credibility for mac because the representative of mac is better dressed, more confident, and in better shape, which are all things that tend to make us trust someone more (maybe they shouldnt, but they do . . . ask me about the Halo Effect if your curious about undue credibility).