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.
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.
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.
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 Kaleesh warlord who later became a cyborg general in the Separatist Droid Army. He was severely injured in a battle, and the Separatists rebuilt him as a cyborg. He was a fearsome warrior, known for his ability to wield multiple lightsabers and his tactical skills in combat.
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.
Obviously, General Grievous is a main character. Since it's a story in the Star Wars context, there could be other characters like his droid minions who assist him in his battles and operations. And, depending on the plot, some Jedi knights might be important characters as well. For example, if the story is about one of his major battles against the Jedi, the Jedi who oppose him in that battle would be key characters.