I have both and will say that they are 2 very different games. I've had Fish Tales for over 20 years and never get tired of playing it. It's a fairly simple game to learn, but I think it's just a blast to play. If it's set up right right, you absolutely have to be accurate with your shots or it's gonna bad news. Flintstones I believe is 1 of the last great sleeper games out there. It looks like a kids game, but there is a lot going on once you learn the rules. I don't think it has the just 1 more game feel that FT brings, but I think it's an excellent game. I think it's a win win honestly.
Good Luck!!