As for chains, I'm not 100% whenever we did traveling, we tried to stay with local restaurants, we found that their food was much better and you didn't have to pay a premium for it.
I'd say try something new and don't go for the same old boring things because they are cheap.
Zellers also offers a seniors discount in their restaurants. They offer very affordable meals. They might not be the best for your waistline but most restuarant food rarely is.