Both are addicting to be honest. It's a preference, if you like slots then it's slots but if you're into sports then it's the most addicting one. You can't compare both on what's the most addicting one, the thing that makes you addicted to something is because you really like it. People are justifying slots is the addicting one because you spent hours to it but that's the nature of the game, it's a quick gambling game, you don't even spent hours just to see the outcome of your first game. That's the reason why you keep pushing because it's a quickie game unlike in bets that you need to wait for the result but it's not the definition of addiction.