Who each tool is really for
Notion
Notion positions itself as a connected workspace where documents, wikis, tasks and lightweight databases live in one place. Its strength is context: the meeting note, the account plan and the process guide sit beside the record they describe. It suits teams whose work is mostly thinking, writing and coordinating, and whose customer tracking is a modest table rather than a machine.
Airtable
Airtable positions itself as a relational database and application platform. Linked records, typed fields, views, automations and interfaces make it a serious tool for structured operational data. It suits teams with real relational needs and someone willing to own the schema, and it stretches far beyond sales into inventory, production and project operations.