Collaboration depth
monday.com
Assignments, in-task comments with mentions, Gantt views and dashboards that compile multiple boards give a real shared planning surface, plus a portfolio template spanning departments. I found no public information on guest or client access, granular permissions, or explicit dependency handling, which is exactly what I must see before two hundred seats land on it.
Stackfield
Shared project work is real here: Gantt views with four dependency types, automatic rescheduling of dependent successors, a critical path and a network diagram, plus cross-project portfolios from the Premium plan and free, unlimited external guests with distinct guest and external roles. What I could not find is any workload or capacity view across people, which is exactly what I need before committing two hundred seats.