I am assuming you are talking about for a vehicle.....
the answer is basically "no". Radar is cheap, has a longer range, but bounces off objects easily. Ultrawideband is more limited in range but can penetrate solid objects to create a 3D map of the terrain/environment.
Basically, RADAR is good is you want to monitor a street, or park, or other open, visible place.
Ultrawideband is good if you want to learn the layout of a building, see if someone is augmented/carrying a weapon, PLUS what radar can do...