I definitely want to own a casino. Just making money is not my main goal.
You can make money by developing a game. And we all want to make money. But I personally like to own a casino. There are thousands of different games in a casino. I don't want to be limited to one game. I want to see all kinds of games very closely. The joy that can be found in a casino cannot be found in one game. Apart from that, it is better to keep the account of making money separate.
You aren't restricted to only creating one game as a game developer. Many developers have different games that they put out because you can't be guaranteed which game is going to get famous and make you rich hence you'll need different options available. Some games can be loved in a country but not trending in another country or casino but when you have different games, they can be trending in different countries and casinos that'll be making you money. There's money in both of them but as you said, your preference is what matters more because when you're doing sometimes that you love, then you're going to enjoy what you're doing and not considering it a stress. Owning a casino will have its own disadvantage as everything has an advantage with disadvantage but it's left for us to determine which one we'll go for.