To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the Crown Signia. But it costs extra on the UX.
The Crown Signia Limited offers an optional Bird’s Eye View Camera to allow the driver to see objects all around the vehicle on a screen. The UX only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
Both the Crown Signia and UX have rear cross-traffic warning, but the Crown Signia Limited offers optional Parking Support Brake (automatically applies the brakes) to better prevent a collision when backing near traffic. The UX’s Rear Cross-Traffic Alert doesn’t automatically brake.
Both the Crown Signia and the UX have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and driver alert monitors.
The Toyota Crown Signia weighs 605 to 727 pounds more than the Lexus UX. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

