To provide maximum traction and stability on all roads, Full-Time Four-Wheel Drive is standard on the Spectre. But it costs extra on the Taycan.
Both the Spectre and the Taycan have standard driver and passenger frontal airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and driver alert monitors.
The Rolls-Royce Spectre weighs 1251 to 1813 pounds more than the Porsche Taycan. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.

