What's the difference between 6-point and 12-point sockets?

6-point sockets grip the flats of a fastener and are less likely to round off stuck or rusted bolts, which is why most mechanic-oriented sets emphasize 6-point. 12-point sockets engage in twice as many positions, which helps in restricted-swing situations but at the cost of fastener grip. Reviewers on tool subreddits routinely flag 12-point 1/2" drive sockets in budget kits as a downside.