There are different types of gamblers depending on what they play. Some gamblers are rounded and play all kinds of types possible but there are those who only stick with one type.
For example, one could just play slots while one just sports betting. My question would be which one do you think is more addicting? Slot machines are more rapid and you can play it more consecutively because it is fast unlike sports betting where matches take time. You might get addicted on sports betting more if you enjoy analyzing things and winning it might give you some pride for your skills. Not to mention that if you are a fan of the sport you are betting on, surely you are emotionally invested in the sport therefore would want to follow it and bet on it many times.
Now, what is more addicting? Slots or sports betting?
Both are gambling, since they are gambling and we already know that gambling is addictive in nature so I believe that it will bow down the one individual gamblers prefer among the two I think that will one decide which one is more addictive but I am to conclude on this question of yours, I will say both are addictive, gambling remains gambling, so I personally feel that none of the types of gambling activity you mentioned here triggers gambling addiction than each other I think it depends on the one individual gambler gambles often.