Buying software is only part of a technology decision. The ongoing work includes data ownership, access, integrations, support, and recovery when something fails. A solution that looks quick to launch can become difficult to operate if those responsibilities are left undefined.
How I approach it
Map the workflow and identify the source of truth for each important record. Compare options against integration effort, recurring cost, security requirements, portability, and maintenance capacity. Use a small validation step before committing the business to a costly migration.