User blog comment:El Alamein/Voldemort vs. General Grievous/@comment-181289-20130924000617

Grevious wins this battle for one reason over any other. He is a true warrior, were as Voldemort is more of a high end criminal or terrorist than anything else, where as Grevious is trained warrior. Not only in his own warrior Culture but also by count Dooku, to hunt Jedi. Voldemort, while a powerful magic user, shows a number of traits that show he doesn't have the same warrior mentality as Grevious. He is highly emotional and prone to rages and and fear. Grevious, while highly aggressive, has much batter control of his emotions and can use them to his benefit where as Voldemort lacks this trait.

Then there is tactical thinking, while Voldemort can do this reasonably well, Grevious is a master of this. His skill allowed him to win many battles in the Clone Wars, Voldemort isn't known for having that many open battles, instead he kills and works behind the scene, and while this is a useful skill, in a pitch battle, it's really not that valuable to be able to do this.

In terms of pure combat skills, Grevious also comes out ahead. He can be incredibly stealthy if he wants to be, and when he attacks, he overwhelm his opponents with his attacks. Up close Voldemort has little chance of surviving and encounter with Grevious, and given Grevious speed and stealth, closing the distance would not be hard.

At long range, which is Voldemort's only hope of winning, he'll have an incredibly hard time hitting Grevious. Grevious has implants at allow him to deflect blaster bolts with his lightsabers. Even if he can't deflect the spells he can easily avoid them.

Grevious can also make better use of the environment for two reasons. One he is a trained warrior and thinks in the manner, how to best use the environment to his advantage. Second his cyborg body allows him to move around the area in unconventional ways, he can climb and crawl into areas that humans can't go, and there for into areas that Voldemort wouldn't suspect. This can put him into very good situations to get the drop on Voldemort.

Voldemort can Teleport, that is a good advantage to have, but in the end, I don't think it's enough to over come his inferior warrior skills and emotional insatiability.