|King Joker|
Your Excellency
@Freshest: At the very least it's implied that Karbin is technologically more sophisticated - but nowhere is it stated or implied he's more skilled than Grievous.
@Valerian: After all, he had often walked unscathed through hornet-swarms of blasterfire, defended only by the Force's direction of his blade; countering twelve blows per second was only difficult, not impossible. His blade wove an intricate web of angles and curves, never truly fast but always just fast enough, each motion of his lightsaber subtly interfering with three or four or eight of the general's strikes, the rest sizzling past him, his precise, minimal shifts of weight and stance slipping them by centimeters.
Grievous, snarling fury, ramped up the intensity and velocity of his attacks-sixteen per second, eighteen-until finally, at twenty strikes per second, he overloaded Obi-Wan's defense. So Obi-Wan used his defense to attack. A subtle shift in the angle of a single parry brought Obi-Wan's blade in contact not with the blade of the oncoming lightsaber, but with the handgrip. -slice-
The blade winked out of existence a hairbreadth before it would have burned through Obi-Wan's forehead. Half the severed lightsaber skittered away, along with the duranium thumb and first finger of the hand that had held it. -Revenge of the Sith Novelization