Both slots and sports betting can be highly addictive but slots are generally considered more to cause addiction due to their fast continuous play and unpredictable nature which creates quick reward cycle that can lead to people constantly trying to win back money.

However sports betting can also be very addictive especially for those who enjoy analyzing games or are emotionally invested in sport as desire to use their skills and follow their favorite teams can be very strong. Rise of live betting has also made sports betting quicker similar to slots but ultimately most addictive form of gambling can differ for each person.