if your older there was a day when mcdonalds was extremely bad. The whole heat lamp thing you might see in movies came out of the way mcdonalds was in the 80's. At that time BK was riding high. They mostly cooked to order (that sorta fell apart at rushes) so your burger was always fresh from the broiler conveyor. One thing about places when they are popular is the food is fresher because they go through it fast. At some point that all fell apart and they started having their patties sit in these plastic warming pans with some sort of oil to keep them moist. I have noticed that this seemed to happen mostly in city burger kings while ones in the boonies still seemed to do alright.
When's the last time you purchased something from either?
My experience now is McDonalds has slipped significantly, whereas BK is just better in most ways. McDonalds prices have even gone up quite a bit yet the food has just gotten worse.