It depends. Some might think he is better in the novel as it offers more depth to his character. Others might have a different opinion based on personal preferences.
I'm not entirely sure as there could be various stories within it. But generally, it might focus on the character General Grievous, perhaps his origin, his battles, and his role in the Star Wars universe. It could also explore his unique abilities and his relationship with other characters through the graphic novel format.
General Grievous was a feared and powerful cyborg general in the Star Wars universe. He was the leader of the droid army of the Separatists. He was known for his four lightsaber combat skills, which made him a formidable opponent. He had a very menacing appearance with his skeletal body and multiple limbs. His backstory involved being enhanced with cybernetic parts, which increased his strength and combat abilities. He was a key figure in the Clone Wars, causing much trouble for the Jedi.
I don't think there is a specific canon comic dedicated solely to explaining General Grievous. But you might find some background info in related comic series.
His origin on Kalee was important. Then, his alliance with the Separatists and the transformation into a cyborg. His many battles against the Republic, especially those where he faced Jedi and his ultimate defeat by Obi - Wan are key events in his story.
One of the most important aspects is his transformation into a cyborg. It made him into a powerful and terrifying adversary. Another is his role as a leader of the Separatist droid armies, which was crucial in the Clone Wars. Also, his combat skills with multiple lightsabers are very significant as it made him a tough opponent for the Jedi.
His story begins on Kalee. He was a significant figure there before his fateful injury. The Separatists' decision to turn him into a cyborg changed his life completely. He then rose through the ranks in the Separatist Droid Army. His encounters with the Jedi, in which he not only fought them but also took their lightsabers as trophies, are also central to his back story. These events made him into the feared General Grievous that we know from the Clone Wars.
General Grievous was a Kaleesh warlord turned into a cyborg by the Separatists. He was a feared military leader. He had a collection of lightsabers he took from Jedi he defeated. His combat skills were formidable, often leading his droid armies into battle against the Galactic Republic. He was ultimately killed by Obi - Wan Kenobi during the Clone Wars.