GitLab: - Allows you to make tasks with descriptions. - Has full support for time tracking and everything. - Has due dates, and allows you to assign tasks to them. - Has organized file storage that can be hacked on and do whatever. - Has a built in Wiki, Snippet Manager, and other cool quality of life tools.
Every "Productivity" App: - Can make tasks with descriptions. - No time tracking. - Sometimes can assign due dates, doesn't display on calendar. - No wiki, snippets, file storage etc.