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?
Just like what you said earlier, dome gamblers like slot games while others sport games so it's based on their like and choice that determines the level of addicting you can find in those gamble. Slot games generally are more compared to sport even in casinos, and honestly sometimes sport games become boring to bet on during their seasons breaks. Personally I don't gamble during preseason games because it's obvious nobody is taking it serious and the coaches go as far as using some of their academy player to play the game to determine if they're fit to join in on the next season.