Which one is more risky ?
Both are risky but doing sports bet have lesser risk than doing casino bets.
I have been doing sports bet for 2 years now and been gaining a fairly large amount of profit from it, back in the days i do casino bet but when i decided to try and see which is more profitable for me casino bet or sports bet, sport bet gave me a fairly good reason to stick with it.
The thing about casino bet is that you are fighting the program itself which the odds for winning is pretty damn low.
While in sports bet the thrill is there to begin with and cheering for you favorite team to win will give a more happier result.