What changes the decision?
A values library saves setup but leaves object relationships and lifecycle in your code. A hosted generator reduces setup while adding plan limits and service terms. Neither is automatically an enterprise data-provisioning platform.
What should your proof of concept show?
Generate a parent and several children. Check foreign keys, uniqueness and an intentional edge case. Then repeat the test with the same dependencies and an explicit reference date.
These are editorial decision criteria, not measured product rankings. Follow the profiles below for product-specific source evidence.