Because I run the Disney race, I don’t race them for time, I can eat pretty much anything, with some focus on starch for longer distances.
I had some Mickey pretzels, some Port Orleans beignet and some spaghetti with meatballs (kids portion was big enough) before some of the races. Other fun meals were hamburger at T-Rex, tacos at Peco Bill and pizza at Via Napoli.
The answer to your question depends on who is running with me the next morning: With DD who needs her sleep before a long race, I would go back and eat at my resort quick service. Pasta or flatbread probably. If by myself, I would probably be trying to see the MK fireworks and not waste park time eating alone so, again, quick service or snacking all day. If it had to be a table service, The Wave would be my choice close to MK. If it is a non park day for me, I would probably end up repeating the beignets at POFQ or try a new place in Disney Springs.