Son had roommates for his first college apartment then lived solo. His first job was in the same city, he moved from the campus area closer to work and lived solo. The next year he shared with someone from work (place hires hundreds every summer)- surprised me but he babysat the guy’s bird when he traveled for work. He knew the other person first. Then he moved OOS and has had solo apartments walking distance to work. Frugal kid with good salary had a one bedroom and downsized to a studio. May change this summer.
It sounds like travel to work is the same at either place. It might be nice for your son to be walking distance to bars et al- easier to consider than needing to arrange for transportation. More spontaneous when just walking gets you there without needing to plan. Living alone can be nice. The other guy is a complete stranger and older. It also depends on your son’s wish for privacy, quiet- introverted lifestyle. With a good income I would vote for the close to the city alone studio.