Absolutely EPCOT. It's perfect for what you describe.
I love taking my time to wander the different country pavilions in World Showcase. Each one has good sit down dining options, quick service, and drinks. Not all of the street performers are back yet (after going away during the pandemic), but many have returned. There's a few worthwhile indoor shows to pop into as well in World Showcase: The American Adventure, Canada Far and Wide, Impressions de France, Reflections of China. You can spend a long time wandering around, eating and drinking. I'd say make a reservation for a fancy dinner at one of the countries at night (Le Cellier in Canada or Chefs de France in France are my reccos).
EPCOT also has a fun and relatively inexpensive tour called "Behind the Seeds." It takes you backstage in their greenhouse (the site of the Living with the Land) attraction. It's cool and interesting. If you do get in the mood to ride something, there are a few options that are gentle experiences and have very minimal waits or walk on: Living with the Land, Gran Fiesta Tour (in the Mexico pavilion), the Seas with Nemo and Friends (which exits into the Seas pavilion where you can wander among the fish in the aquarium.
I would probably choose Animal Kingdom for your second park.
This park has had a major glow up. The themeing and ambiance is incredible and definitely worth taking your time to explore. Just wandering Pandora is awe inspiring, and you'll want to do it during the day time and then come back at night to see how it changes and glows! The Africa section is also impeccably detailed. There's tons of great snacking (including a Dole Whip location in Africa). You could take in shows like Finding Nemo or Tough to be a Bug without waiting in much of a line, if at all. And you can see a lot of animals by just walking around (definitely explore Discover Island at the front of the park for some birds. And the Maharajah Jungle Trek is a great way to walk around and experience a wide variety of animal life). There are a few animal tours you can purchase too (I believe both the Gorilla and Elephant focused ones are now back in session). And for dinner, Tiffins is the best kept secret of the park. Its expensive signature dining, so you'll want to budget for that. But the food is impeccable and incredibly unique (with knowledgeable servers who will explain every meal to you if you dont know what an ingredient is). If a meal there is too pricey for you, consider hanging out in The Nomad Lounge, attached to the restaurant. Great cocktails, the inside is swanky but comfortable while the outdoor porch is great for people and bird watching.
I would only pick Hollywood Studios if you have Star Wars fans in your party. If that's the case, it will be fun to walk around Galaxy's Edge. But I don't think much of the quick service food in that park is anything to write home about.
