Behavioral DoS is much more effective against mitigating multi-vector Layer 7 DoS attacks.
Stress-based DoS is better at defining specific rate limits.
Technically it is possible to configure both protections concurrently, complementing each other.
From experience I recommend against configuring both of them together. BaDOS alone is fine, it works reliable. Setting threshold values for for stress-based mitigation can be cumbersome and is error prone.
Details about the mitigation methods can be read here: