Trust me... there's no comparison between a kettlebell and a plate swing... such a big difference and so MUCH (feels like triple or so with the same weight) more eccentric loading on the kettlebell variation.
ive done kb's while at perfect competition, not my cup of tea.
i even prefer strict plate/db swings actually.. of course you can do strict swings with kb's too.
one of my favorites is just a 'hipless' powerful plate swing (using both arms).. just trying to get massive power from shoulders without any hip extension etc.
that was probably my favorite swing exercise.