Licensing and control
This is the fault line. One route gives you a supported commercial product with defined obligations; the other gives you the code and the freedom, and the responsibility, that comes with it. Neither is inherently safer. They fail in different ways, and you should choose the failure mode you are equipped to handle.
Deployment and hosting
Ask both what hosting options exist today: vendor-hosted, partner-hosted, or your own infrastructure. If data residency is a requirement in your market, put it in writing at shortlisting rather than discovering the constraint during implementation.
The size of business each assumes
Both serve small and mid-sized businesses upward. What differs in practice is the support expectation: a proprietary vendor assumes you will call them, an open-source project assumes you or a partner will investigate. Match that to your team honestly.
Breadth versus depth
Both are suites, so both trade depth in individual functions for coverage across the operation. Sales is the usual casualty, because pipeline work is about behaviour and follow-up rather than documents and postings.
Implementation effort
Partner-led in most cases on both sides. Budget for discovery, masters, migration and training, and expect a phased rollout in which the sales module arrives after finance and inventory are stable.
Channel coverage
Calls and WhatsApp are usually handled by extensions rather than core modules in this category. Confirm what each supports, because in Indian and Gulf markets those two channels carry most of the conversation that decides an order.