Maul is hotheaded and arrogant, just as much, if not more, than Anakin. Which is why he was killed by Padawan, Ataru enthusiast Obi-Wan, while Dooku repeatedly sonned Jedi Master, Council Member, Soresu Master Obi-Wan. But if that isn't enough for you, consider Dooku was the one of, if not the, greatest duelist of the PT era, who defeated Windu, prior to TPM, Obi-Wan, twice, Anakin, and held off Yoda for some time. Here's a breakdown:
Maul - Hotheaded, silent, arrogant, killed by padawan Obi-Wan. Managed to kill Qui-Gon. Shows little skill in the Force, managing to do simple Force pushes.
Dooku - Cool, calm, collected, killed by Anakin due to Sidious' betrayal. Managed to repeatedly defeat Jedi Master Obi-Wan, and had the opportunity to kill him twice. Disarmed, literally, Anakin. Shows adeption to the Force, able to Force Grip Obi-Wan and throw him a great distance while defending his back from Anakin. Shows more power over the Force than Obi, giving him an immediate advantage over Grievous.
Or, if this isn't good enough, for noobs:
Dooku > Jedi Master, Soresu Master, Council Member Obi-Wan (twice)
Jedi Master, Soresu Master, Council Member Obi-Wan > Grievous
Padawan, Ataru Enthusiast Obi-Wan > Maul
🙂