There was one recent video I watched with one fella wagering $1,000,000 including 5-figures bonus buys on slots. The results were disappointing to say the least!
Holy moly! That's an elite right there. He probably kicked the shit out of everything after losing that kind of money in a matter of minutes. Dumb!
The difference is that with sports betting, you have to wait for the match to end, whereas slots are a matter of seconds. I'd say that's why they're more addictive. They keep the dopamine rush consistently higher.
You can get a higher rush from slots for sure, but it's possible to get a higher rush from sports betting too by live betting on various markets. There's also the added benefit of skill involvement in sports betting.