What the comparison is really about
This is not just a catalog-size argument. It is a workflow argument. The important question is whether the team needs fixed songs for editing or a calmer B2B workflow built around long-form listening and delivery.
Where Luppen is stronger
Luppen is stronger when the audio needs to fit a product or ambient environment, when discovery is more curated than broad, and when one rendered output is more useful than picking independent tracks.