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 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.
In the Rasputin story, Rasputin was a self - styled holy man. He came from a humble background but managed to worm his way into the inner circle of the Russian royalty. He was believed by some to have healing abilities which is what initially attracted the attention of the Tsarina, who was desperate to find a cure for her son's illness. However, his unorthodox behavior and the influence he exerted over the Tsarina made him a polarizing figure in the court and in Russian society at large.
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.
General Grievous is a really cool and complex character in Star Wars. His story begins with his past as a Kaleesh. But after his transformation into a cyborg, he became a key figure in the Separatist movement. He was designed to be a counter to the Jedi. His mechanical body gave him enhanced strength and speed. He was constantly on the hunt for Jedi, seeing them as a challenge. He had a kind of arrogance about him, believing he was superior in combat. In many battles during the Clone Wars, he led the Separatist droids and often engaged in epic lightsaber duels with Jedi knights. His presence added a lot of tension and action to the overall Star Wars saga.
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.
Another possibility is a crossover with the Halo universe. General Grievous could face off against the Spartans. His multiple limbs and lightsaber skills against the Spartans' advanced armor and weaponry would make for some intense combat scenes. The story could explore the differences in their cultures and fighting ethics.