While not legal in many places to do a rolling stop, for the most part I find them safer if done correct. It allows you to get up to speed quite a bit faster while using a bit less energy. Something good for the environment and can keep traffic flowing better.

Also a full stop is harder on your vehicle. It puts more force on your bushings and brakes. You notice it on a hard stop where you feel that brief reverse movement. It rather minor if your not overly aggressive.

It rather small stuff but the flip side is some people will do aggressive rolling stops negating much of the safety factor. Thus the rules are enforced black and white.