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The cleanslines of the AC waveform from the mains or an inverter type generator has more to do with the local environment than the actual supply.
A rotating alternator will produce a pure sine wave AC voltage. If it it drives a purely resistive load there should be no harmonics generated.
The mains is supplied through long cables (inductance and capacitance) so switching transients can be produced depending on load changing and are largely unpredictable.
The inverter type generator rectifies the AC to drive a switching type power converter (inverter) with feed back (to control the output voltage). This generates a wide spectrum of interference at harmonics of the switching frequency. However the output is passed through a narrow band filter that removes most of the interference.
This output will normally look quite "clean" on an oscilloscope but will probably still have a fair amount of harmonic content if examined on more sensitive equipment.
The final transient content of these generators will however also be mostly dependant on the type of load.
Barry
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