Common choke in full bridge class D

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What is the advantage and disadvantage of common chokes, used in full bridge classD, like pic. no.2?
 

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David , your inductor is wound in common-mode fashion, its good in class-BD when at idle, no signal conditions. But when the duty cycle variation begins with signal, it triggers the saturation very easily, because the flux charging discharging cycle time period is asymmetric......since carrier is in Phase, Audio is out of phase...................

if you wound a differential inductor and put it in bridged Class-D with AD modulation, it would not saturate and also provide more inductance with lesser number of turns.
 
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