In general, expat status remains the most attractive for an employer.
As French social security contributions are high, expatriation using private contracts to accompany the employee abroad often offers better coverage at a lower cost. It also allows for more flexibility and contract negotiation with the employee directly. However, it is essential to prepare this change in advance, to study precisely the local conditions of social protection.
Detached status is often interesting for employees going abroad for short periods (less than 2 years).