Congratulations! You've just won one free meal a day for life at one nation-wide fast food restaurant of your choosing. What restaurant will it be?

For example, you could choose the nation leader in the US and get a free breakfast, lunch, or dinner every day for life at McDonald’s.

For the sake of clarity, I’ll define “fast food” as a restaurant with a counter order-taker and no server.
(Technically that excludes Pizza Hut but includes Dominoes.)