Who each tool is really for
Attio
Attio positions itself as a modern CRM built around a flexible data model, aimed at teams that found traditional CRMs rigid but found spreadsheets and databases too manual. Relationships, companies and activity are first-class concepts, and the product intends to adapt to your process without becoming a build project. It appeals to startups, investors and go-to-market teams who care about data structure but do not want to run internal software.
Airtable
Airtable positions itself as a flexible database and application platform rather than a CRM. You get tables, linked records, views, automations and interfaces, and you decide what a deal is. It appeals to teams with a builder who wants exact control, and to operations use cases far beyond sales where that flexibility is the entire point.