Epcot easily dominates for quick serve - there's such an abundance of variety and quality compared to the other parks because of the World Showcase diversity...plus some of the food booths from the various festivals are becoming nearly year-round installations, so even more options are often available.
Sunshine Seasons in the Land always has great fresh and healthy variety, Connections is pretty solid for pizzas, burgers and sandwiches, Festival Favorites can have some good selections depending on what they're offering when you're there. Even Odyssey during the various festivals has some solid options.
The World Showcase quick serves are almost all very good, assuming you like that ethnicity of food. Katsura, Creperie, Regal Eagle, Cantina de San Angel, and Lotus Blossom are my favorites. The Italy pizza window is good too, but for me I rarely want to sit outside in Florida eating a hot pizza, so much as I love pizza, I reserve it for indoors or nighttime,