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.