Ann,
These are both great breakfasts to start your day. While I list your hosts and some of the guests that are often visitors during these meals, it is important to emphasize that characters are subject to change. So let's look at both;
At the
Garden Grill Restaurant in
Epcot, your hosts Chip & Dale are often joined by Farmer Mickey and Pluto. I love this restaurant, both for the characters (and their cute farm outfits) but also the views into the
Living With the Land attraction and pavilion. Some of the food you can eat there is even grown inside the pavilion, which I think is just really cool!
At the breakfast at the
Cape May Cafe in
Disney's Beach Club Resort, Minnie Mouse hosts you, often joined by friends like Goofy, many in beach attire. This is a great buffet, which makes it ideal for a family with varied breakfast favorites.
While I genuinely like both, I would choose the Garden Grill if Epcot was my park for the day, and the Cape May Cafe if I was headed elsewhere.
Have a Magical (and delicious) Vacation!