Start with this:

Maintenance - your product, your location

Repairs - customer product, your location

Field Services - customer product, customer location

Also look at your need to use Sales Orders, Subscription Services, Tasks, Timesheets and Worksheets to understand if you are the exception to this "rule".

Odoo's Maintenance, Repairs, and Field Services apps serve distinct purposes despite their similarities.

  Use the Maintenance app for managing internal equipment maintenance schedules and preventive tasks.

  Opt for the Repairs app when handling product repairs, especially those involving warranty or customer service.

  Choose the Field Services app for managing on-site services, such as installations or customer visits.

If you’d like to explore this further for your use case, you’re welcome to connect with us at Pragmatic Techsoft.