Agile focuses on prioritizing tasks and enables you to ship products faster to market.
Monitoring from early stages and regular inspections allows the product owner to make adjustments and gives the team early sight of any quality issues.
With every sprint, determine backlogs, and evaluate changes in features, defects, or other maintenance tasks.
As tasks are under the time-box sprints, it helps plan each release and monitor the dates for the next release.
Fixed time helps following fixed budgets. The cost is planned and supports scaling the project.