Asana gives you lots of project management features if you have a big team and time for setup, but Routine feels scattered and confusing by trying to do too much at once.
Only use Routine if you really want all-in-one planning and don't mind the lack of focus, but Asana is the pick for structured project management.
Asana actually delivers on complex project management, but only if you're willing to put in the setup time and keep up with manual upkeep. It's built for larger teams or organizations with a project manager who can wrangle all the features, custom fields, and reporting. If your team needs to track lots of moving pieces, manage workload, or report to upper management, Asana's traditional project management structure and deep functionality will get the job done.
Routine, on the other hand, tries to be a daily planner, a knowledge manager, and a project tool all at once, but ends up being confusing and clunky. It's not intuitive, it's easy to mess up core settings, and it lacks the clarity and polish you'd need for any kind of serious project management. The labels and database features add mental load without actually helping you manage projects better. Even as a basic planner, it feels awkward, and for business or team use, it just doesn't hold up.
If you actually need project management, tracking tasks, managing team workload, reporting, handling complexity, Asana is the only real choice here. Routine might work if you just want a free personal planner to play with, but it is nowhere near ready for managing real projects. Go with Asana if you care about project management at all.