i have ridden King De Ka, but it wasn't the best. It gave me an extreme adrenaline rush. I actually got to ride it twice in about 15 minutes, so the adrenaline rush built up even more.
The all time best was El Toro. It put the most physical strain on your body and was insanely fast for a wooden coaster. The drops didn't gradually go over the hill, they sped up and launched over the hill. It has the records for the fastest, steepest(in the turns and the hills) wooden roller coaster.