Usually slow motion clips are more visually appealing, the problem is they take much longer to compute and bake, to say, if you want your clip to display 10 times slower, you should compute and bake 300 fps.

For dynamics scenes there is a trick which allows to “emulate” slow motion at the normal rate of 30 fps, this is using reduced gravity, medium or a quarter of normal gravity, making this you get the objects and fragments fall slower and the result is close to real slow motion.