Well Dooku had trouble with a lesser Savage and Ventress. With Maul instead of her and Savage being better trained and more powerful, I think he'd be extremely hard-pressed against them both.
And Dooku was visibly treating kenobi as a non-factor, even with skywalker's presence, something the brothers couldn't do (please log in to view the image)
Regardless, I've already noted that Dooku would be beaten by the brother's more times than not, merely that solo'ing is a possibility.
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I'd suggest that while Anakin/Obi-Wan are an overall superior team, Maul/Savage would be harder for Dooku to fight. Dooku can't take out or toss around Savage with the Force like he could Obi-Wan (and can only stun and enrage him with lightning) and his strength is a problem for Dooku to handle. Plus Maul isn't as reckless as Anakin.
Savage can "arguably" block Sidious's lightning after training with Maul,(Depending if you give any credibility to the delete scene) albeit with help. He should be able to defend himself against Dooku's now.
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Dooku is not soloing. That being said with Ventress as back-up the brothers would probably lose.
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