Voyager is a recommendation system based on variables characteristics present in data. User is mostly limited by the offerings of voyegar (same story of https://github.com/vega/polestar).

Vega is descriptive version of d3. We find it hard for debugging and creating complex viz.

Vega-lite is concise and more intuitive version of vega though.

However Muze was created to start directly from data, creating layout, composable layers, automatic cross interaction and a robust interaction mental model. Muze is inspired from VegaLite-InfoVis and Snap together viz paper.