6-PWM gives you full control, depending on the driver / hardware used. So you have control over the dead-time insertion, optimising for your MOSFETs. And you can tie events/interrupts to the PWM generation to sync current sensing or voltage sensing to the commutation.
Both FETs off puts the half-bridge into “Hi-Z mode”, and is used for example in 6-step commutation and back-EMF sensing, IIRC…
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