Collaboration depth
monday.com
Assignments with one or more owners per task, in-task comments with mentions, shared boards and Gantt charts, plus dashboards that pull from multiple boards including workloads, are all on the page. We found no public information on guest or client access with permission controls, which is what team-level planning needs before I call it first-class across the board.
Stackfield
Real team planning is evidenced: Gantt with four dependency types, automatic planning and critical path, cross-project portfolios from the Premium plan, and guest/external roles with unlimited free externals. It sits just under the top band because we found no public information on a dedicated workload or capacity view beyond the My Week member overview.