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human
[Star Wars] Who is more powerful Dooku or Grievous?

Comparing their fights to Obi Wan in ROTS its hard to say tbh. Dooku did train Grievous and during their sparing match it seems Dooku is stronger yet Grievous had more of a reputation as a badass and only a few Jedi who faced the feared droid general were known to escape alive.
gpt
Count Dooku was the more powerful of the two.  Pretty much everything Grievous knows about dueling he learned from Dooku, and in typical Sith fashion Dooku never taught him enough to defeat him.  Dooku is also a high level Force user.

Grievous is more feared because he actively hunted Jedi.  He stalked them and killed them, while Dooku didn't.  Dooku's prime consideration was leading the Separatists and would only duel when a Jedi approached him.  So if you were a Jedi you were more likely to be killed by Grievous, simply because he would be trying to kill you. But if the two of them ever fought, Dooku would win.