To do well in either Slope or Downhill you need balls.
Downhill is an entirely different animal then GS or Slalom. Downhill requires a mental toughness beyond slopestyle. A downhill run is like a minute+ of sustained high risk exertion. Where as slopestyle is like 5 seperate instances of high risk with a chance for a slight breather in between. Plus a slopestyle run shouldn't be comprised of new or high risk tricks, a slopestyle comp run should be your best stuff you have dialed, so potenially not as risky.
Training and learning new freestyle tricks is where the balls come into play, you gotta muster the nerves to huck whatever it is that first time. But in competition formats you are in general doing more practiced tricks.
Nobody without some level of mental fortitude combined with reckless abandonment will do well in either slopestyle or downhill. But I would classify more of the downhillers I have known as having a couple of screws loose then I would the slopestylers.
