The first thing that people should know neither slots or sports, both of them aren't a way to make money.
Don't make it complicated, each person has it's own preference which game he want to gamble, as long as you're interested with the game, you can play any game you like including both of them.
Casino Gambling involves Playing games that are base on luck factor and sometimes our skills also work out in this, it does not involve live event.
What skills?