You could start out by asking her what she wants in a car. I would personally go with the Civic based on a few things: First, it is more fuel efficient than the Fit while being larger AND more powerful than it. Also, there's a lot more passenger volume in the civic, which means that if she's ever taking her friends on a drive (could happen!), they'll be much happier. Additionally, the Civic has a lot more features and is an ultimately more upscale car than the Fit. It's probably a smoother, more comfortable ride. If your grandma gets the EX, there's some features that would be included that you'd never expect to find on an "economy car"(i.e. leather/power seats, navigation, sunroof, etc) And, as a fellow answerer said, the seats can be adjusted in more ways than in the fit.But overall, whichever she chooses, she can't go wrong. Just know that, although the Civic is more expensive upfront, it's--in my opinion--a better choice based on the simple reasons I stated above.