Notion vs ClickUp for B2B service agencies is a false binary. Notion is a wiki that learned to track tasks. ClickUp is a task manager that learned to hold documents. Both fail when forced to fully replace the other. Notion wins on knowledge architecture — SOPs, wikis, client reference libraries. ClickUp wins on delivery execution — time tracking, Gantt charts, workload views, automation at scale. The real answer is often both.