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Class A distortion vs Class AB noise

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I'm investigating voltage controlled amplifiers for use in analogue oscillators and I came across an interesting comment in the data sheet for the AD SSM2018T:

"The SSM2018T combines the low noise of class AB topologies with the low distortion of Class A circuits". I'm assuming that AD's design engineers know more than I do on the subject.

Obviously the chip runs on transistors but my question is - Does this apply equally to V/T circuits? Is a Class AB circuit inherently quieter than the equivalent Class A circuit. If so, why?
Mark Kelly

Follow Ups:

RE: Class A distortion vs Class AB noise - Solder n Listen 14:14:25 07/06/08 (1)
- Thanks - Mark Kelly 15:00:16 07/06/08 (0)
RE: Class A distortion vs Class AB noise - Eli Duttman 05:29:12 07/06/08 (0)
Aren't we talking about PS rejection here? (nt) - Naz 04:20:40 07/06/08 (0)
RE: Class A distortion vs Class AB noise - Ray Moth 04:00:07 07/06/08 (0)

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