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Era-adjusted Maddux-Glavine are clearly better, but if the question is which two I'd rather have in my '11 rotation I'd take Halladay-Lee.
I'm not sure if Maddux does better than either of those two in the current era though I think he'd be around the same level. Halladay-Lee are both precision AND power.
Glavine I think is a clear tier below those three which makes it a relatively easy choice for me.