The short answer
Use an existing platform when it supports your essential workflow at an acceptable operating cost. Consider custom software or an integration layer when important workflows, data boundaries or system connections cannot be met reliably.
Map the essential workflow first
List what people need to accomplish, including approvals, corrections, reporting and support. Separate essential requirements from preferences about how the interface should look.
Ask shortlisted platforms to demonstrate your actual exceptions. A typical demo may not show a partially completed order, a disputed record or a user working across two departments.
Compare three options, not just two
An existing platform can be a strong choice for a standard workflow. Custom software can be appropriate when the workflow itself differentiates the operation or requires a level of control a packaged product cannot provide.
There is also a middle path: keep the core platform and build a focused integration or application around it. This depends on supported interfaces, access terms and a clear boundary between the systems.
Include the cost of operating the solution
Compare licensing, configuration, integration, training, support and change requests over a realistic planning horizon. For custom software, include maintenance, infrastructure and the team responsible for it.
Count manual workarounds as operating effort. A lower licence fee may not mean a lower total cost if staff repeatedly copy records, reconcile inconsistent reports or maintain an unofficial spreadsheet process.
Make ownership and exit practical
Clarify who owns the data, how it can be exported, what access is available and what happens when the commercial relationship ends. For custom work, document source-code rights, third-party licences and handover obligations.
A contract alone does not make a system easy to operate. Ask what documentation, administrative access, recovery procedures and training are included in the delivery.
Test the riskiest assumption before committing
Choose representative tasks and evaluate them with the people who perform the work. A focused configuration exercise or integration pilot may reveal more than a long list of feature comparisons.
The right answer may be an existing product, a targeted build or a staged combination. Let the evidence from the workflow guide the decision.
Your planning checklist
- Essential workflows and exceptions
- Supported integrations and access terms
- Total operating effort, not just purchase price
- Data export and ownership terms
- Maintenance and support responsibilities