Directory starters are built for listing and comparing many items — think curated marketplaces, "awesome lists" turned into a site, or review platforms. They come with search, filtering, and detail-page patterns already solved.
Directory starters are a narrower niche than SaaS or landing pages. Check whether search/filtering is actually implemented or just a design mockup, and whether there is a submission flow if you plan to accept listings from other people rather than seeding the data yourself.