From this thread I have learned that McDonald's serves literal human burgers. The ingredients seem to keep changing. When I was a kid, my uncle claimed they were made with worms.
As of late, I mostly stick to Chick Fil-A. You can't beat the quality and the service. Sometimes we go to a specific Wendy's that we know has good management.
When I was a kid, my grandma would be bring me to McDonald's. Hot fudge sundae with nuts was my favorite! I'm not sure that I trust a modern McDonald's to clean the ice cream machines.

McDonald's NEVER looks this appetizing in 2020!