For enhanced safety, the front and second-row seat shoulder belts of the Land Rover Discovery have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Mazda CX-9 doesn’t offer pretensioners for its second-row seat belts.
Both the Discovery and CX-9 have child safety locks to prevent children from opening the rear doors. The Discovery has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The CX-9’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
When descending a steep, off-road slope, the Discovery’s standard Hill Descent Control allows you to creep down safely. The CX-9 doesn’t offer Hill Descent Control.
Both the Discovery and CX-9 have rear cross-traffic warning, but the Discovery has Rear Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The CX-9’s Rear Cross Traffic Alert doesn’t automatically brake.
Both the Discovery and the CX-9 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras and rear cross-path warning.
The Land Rover Discovery weighs 456 to 736 pounds more than the Mazda CX-9. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

