A commuter/urban helmet is specifically designed for city riding and everyday practicality, so it's the better choice if that's your main use case. Unlike road helmets, which prioritize being ultra-light and highly ventilated, commuter helmets focus on visibility and convenience features that matter in traffic—like integrated rear lights, reflective accents, and sometimes even rain covers.
The trade-off is that commuter helmets tend to be a bit heavier and less ventilated than road helmets. They also have a more casual, rounded shape that looks less sporty but pairs better with everyday clothes. That said, if you're riding at a relaxed pace around town, the reduced airflow is rarely an issue.
Where a commuter helmet really shines is the visibility factor. Being seen by drivers is one of the biggest safety concerns in urban riding, and the built-in lights and reflective elements give you an extra layer of protection that road helmets simply don't offer. If you're commuting, running errands, or using bike-share systems, go commuter.