How do you maintain a living competitor library?

I'm building a research habit around adjacent businesses, creators, and products in my niche (game character art education and portfolio mentorship). The goal is a living library I can keep adding to over time, tracking what each competitor sells, who's running it, and details like their email domain.

Right now I do all of this inside Claude. It works for ad-hoc digging, but I keep seeing people online lean on NotebookLM and similar tools for research, and I'm not sure if I'm leaving capability on the table.

Two things I'm trying to figure out:

For ongoing brand and market research specifically, is Claude actually a solid choice, or do tools like NotebookLM do something meaningfully better for collecting and querying sources
If you were building a competitor library you'll return to and expand, how would you set it up?

Curious about the actual workflow, where you store entries, and how you keep it queryable as it grows.

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How do you maintain a living competitor library?