Collaboration depth
Asana
Assignments, dependencies, milestones and timeline/Gantt views form the backbone, and Portfolios plus Workload give real cross-project and capacity planning with drag-and-drop rebalancing; guests are free and unlimited on Starter, with guest-permission and view-only controls higher up. Capacity measurement runs on task count only — hours and points are marked coming soon — so the department-grade span of the top anchor is not fully evidenced.
awork
Free client and freelancer collaboration with no extra license fees is exactly the guest-access model I want to see, and team-calendar integrations explicitly tied to capacity planning imply a real team-level view. But the evidence is silent on assignments, comments, dependencies and shared timelines, so I can't credit this above solid-shared-projects level.