I preferred Arby’s for the roast beef and horseradish sauce. They also had roast beef on an onion roll. I boycotted the place for more than 10 years after getting food poisoning at one in State College PA while in college in the early 80’s. When I finally felt comfortable going back, it was as good as I remembered it.
At Roy Rogers, I preferred the Double R burger, basically a cheeseburger with a slice of smoked ham on it.
