You are right, however if for me and I have to choose between the two, I think I'll choose sports betting as day trading is very stressful, the market is 24 hours, that will attract you to trade more, unlike in sports betting that you just have to focus on a certain game, and even with the small number of hours, you can get the job done already and rest for the rest of the day.
I'm not saying day trading is bad, this is just me, I'm saying based on my experience and that is my preference here.