Both have their strengths: one gives you constant dopamine hits, which can quickly lead to addiction. In sports, although betting may occur less frequently, the pleasure could be more intense, especially when you enjoy the sport you're betting on.
Perhaps for someone who pursues profits more, slot machines will be more affected because they can yield quick results. But for someone who enjoys sports more, they will surely get more pleasure. But not everyone is affected by betting in the same way. Some people are mentally stronger than others and tend to know how to control it.