SanguineRemedy
Speed Demon
Technically Keith Richards isn't that great of a guitarist and you could rank a number of players ahead of him including Angus. But Keith is king of the riff. No one has produced more riffs that developed into great songs than Keith, no one.
I would say Chuck Berry is the king of the riff, but the two were great friends... and definitely influenced one another, both being so grand on the rock scale.