Both have fallen off a lot. Karlsson May have even regressed more, but I think EK is still better today. He was just that much better to begin with at his peak.
LA is a terrible team. I wonder if Doughty himself has truly fallen off or his team has....
At his peak I absolutely take Doughty. A two way defensive monster. Karlsson was never, ever close defensively. Karlsson at his peak, unlikely to be reached again, was likewise far superior offensively.
With that tunnel vision, Doughty is my easy choice. I prefer the player who produces offensively AND plays elite defense. Now, it is even easier with Karlsson's decline and contract.
The poster above may suggest Doughty is overrated but if that is a question, then what on earth is Karlsson if not incredibly overrated because of his peak's offensive production.