My pick is a casino I have little time to do analysis or follow every team or player's statistics, the only sporting events I bet is boxing and our local basketball but all the other international sporting events I just cannot follow with so many of them, I treat playing in casino as a stress reliever and my funds are all allocated so far I'm good doing that, enjoying and sometimes makes money out of it.
What you're doing is perfect. You only bet on the sports that you know and it should be done like that. Just like me, I only place bets on the sports that I know but when I want to enjoy, I'll just choose to play the casino games. When I have more spare money to gamble with, I'll be choosing any of the two until I'm dry with funds. Since the reason is to have fun, I wouldn't put myself into the budget but that's happening before most of the time but these days, I should be wise with my budget so sometimes I'm sticking to sports betting.