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I think PWM is better because noise does not affect at all, what is important is the pulse width in the PWM PS type. Nevertheless if peak noise exceeds or increase signifincantly it is possible the switching transistor duplicate it and originate a damage, anyway if peak suppresor is used in the output transistor we won't have problems, well, until components works under its electrical specs. Normal degradation will affect the PS operation. We need to consider the component's quality.
For more detail in discuss see:Thread: PWM and PFM advantages ? differences in Boost converter apps
One trend I seen is increase switching frequency. I saw parts switching at 8-10MHz. I expect switching frequency to continue to go higher. Another emerging trend (not mainstream yet) is using process other than CMOS or bipolar.
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