5G is better than 4G. It's high bandwidth because higher frequency. Higher frequencies are safer because they have less penetration. So you need transmitters spread out more to make up for the reduced signal at the device from absorbtion of the high frequencies. 5G safer than 4G.

5G is also more energy efficient because it handles bounced signals better, and it's just newer tech with newer chips. Thus you can do more with less watts to the receiver.