I consider slots more addictive because everything is a matter of luck, with sports betting you have to think, analyze, see, search for news, do a good job to get a good prediction result, the difference in these is that slots can entertain you so much that you spend money almost without realizing it because the emotions they unleash are many, I would say slots and for that same reason and because by betting little you sometimes win a lot.
Slot machines are designed in such a way that people easily become addicted, especially in the case of physical casinos, where the exciting sounds, lights, and instant rewards all create a kind of mental excitement, which makes you more interested in gambling and all in all, a kind of confidence is created in you, which makes you feel like you can win very soon, in short, these things keep you locked in to gambling, you cannot get out of them easily. So slot games are definitely more addictive than sports betting.