High RPM Generator - is 60Hz worse?

[a64pilot]

Intended use, and weight and size are considerations as well as price of course.
I intend to keep our generator runs to twice a week, for four hours each, total 8 hours a week.
For that a standby, mid RPM genset is fine, plus its relatively light weight and small in size
My little Nexgen weighs 160 lbs, the little Northern Lights I think comes in at 377 lbs.

Now if I intended to run a generator pretty much all the time, then the Northern Lights would surely be a better bet.