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.
You should know one thing that not always smaller odds teams will win sports because many times these teams have given surprises and if you lose those small add bets and want to recover from these smaller odds bets again means takes a lot of time and sometimes you may not even recover also. I do agree sports betting is better than playing casino games but not agree that always smaller odds teams will be going to win.