I don't know which business generates more money, but from what I know, gambling is a lucrative business, where casinos gain an advantage over players through their house edge. Gambling is also an industry with a huge turnover—even if the profit margin per transaction is small, the volume of transactions is very high, allowing casinos to generate significant profits per day. Not to mention the potential income from the large number of players who continue playing due to addiction or the hope of winning big. Furthermore, most casinos are now increasingly accessible to players, allowing them to tap into a wider pool of potential gamblers. So, from this alone, we can see that casinos can generate more money, and more consistently, if they manage it well.