Unless your grandmother is a career gamer, Mac. Holy stuff is it easier. You buy it, you plug it in, you give it registration stuff, and that's it. If she has trouble with her eyes you can zoom in with the magic mouse. They're faster and more contained, in that there's no big box with a dozen wires plugging into it. The Finder is easy, and you don't get stuff every day telling you that some random thing has expired, which would just confuse her. I doubt she'll want to do a lot of right clicking, which might also confuse her, but if she does it can be switched in system settings. The list if pro-Mac reasons goes on. Although they're more expensive, it is truly worth it.