Power amp under development

Hell All, after a long time..
A short question about final stage drivers:
Why in Quasi amplifiers and (almost) all the NMOS I have seen are they always medioum-power BJT?
I have tried simulating with MOS drivers, and it actually behaves even better at clip conditions. It seems there are no signal max amplitude losses compared to BJTs, too. See attached picture (hopefully it is readable).
Any comments?
Thanks
@audio
 

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