Just saw plottablejs. I can make an informed comparison without using it.

However https://www.charts.com/muze/docs/composing-layers explains some part about muze's composability. And this is an example https://www.charts.com/muze/examples/view/composition-of-lay...

Apart from composable layers Muze has - tabular layout (visual crosstab) created from data facets https://www.charts.com/muze/examples/view/crosstab-chart - auto interactions https://www.charts.com/muze/examples/view/crossfiltering-wit... - Legend on any chart https://www.charts.com/muze/examples/view/gradient-legend

etc...