Start with the user and the moment of use
The right format depends on who uses the software and where. A back-office team at desks has different needs from a field engineer with a phone in one hand.
Choose a web application when
Users work mostly on computers, the workflow has many steps or forms, or you need customers and partners to access it without installing anything. Web applications are easy to update and work on any device with a browser.
Choose a mobile app when
People are on the move and need the camera, GPS, notifications or offline access. Field attendance, delivery proof and site inspections are typical examples.
Choose a dashboard when
The main need is to see and understand information from existing systems. Dashboards turn data from ERP, devices and spreadsheets into charts, targets and alerts for managers.
Often it is a combination
Many businesses end up with a web application for administration, a mobile app for the field and a dashboard for management, all sharing the same data through an API. Building the API first keeps that option open.
A sensible way to begin
Pick the one workflow that causes the most pain, build a small first version, and learn from real use before expanding. This lowers risk and keeps the budget under control.