Well, every game has its own risk. Not sure but for me I think risk is more manageable with sports betting simply because a bettor could make his own analysis based on player statistics or team's performances unlike with pure luck based games wherein you'd only rely with your fate. However as I said, nothing would be certain. The risk of losing will always be bigger than the tendency to win. Thus, it would always be better to prevent oneself to be too confident and to bet everything on the line. Always be mindful of the consequences.
Card games indeed is a option because there are working strategies such as card counting that could help a gambler win. But luck plays it still for this game in particular with card distribution which is why I believe sportsbetting is still a better option. Also, I guess it would depend on the player's preference given that we're good on different games on our own.