it kinda depends on the size of the chain. like there is a burger place near my house that has the best burgers but its not a chain. For the been around a long time and large chains I felt wendys held up the longest. Burger king was great in the 80’s but went down hill. It seems that its still decent if you are away from a major metro area. Basically they are not cooking on demand in high density places. You can still request it be cooked and made fresh which makes a big difference. their patty is skinny as heck still now.