For me they are both risky, I don't think about those which is more risky. But as long as there is a risk involve they are qualified for it, so for me whether you do casino bets it is risky or sports bet.
Both are risky, but playing casinos is more risky than betting on sports, we can stay away from the risk of losing on sports betting by looking for small odds, I think in this way we can stay away from the risk of losing.
I guess so you are right, I just realized that sports betting is a game where the advantage will be on the bettor. As long he will do good analysis, the chance of winning is very big. He only needs to apply what he has learned for being a sports bettor but in casino bets. There will be hard time to know and predict that you are going to win.