Terror is usually described as the feeling of dread and anticipation that precedes the horrifying experience. By contrast, horror is the feeling of revulsion that usually follows a frightening sight, sound, or otherwise experience.
Horror has also been defined as a combination of terror and revulsion. According to Devendra Varma in The Gothic Flame (1966): The difference between Terror and Horror is the difference between awful apprehension and sickening realization: between the smell of death and stumbling against a corpse.
Basic roulette strategies, like the Martingale or Fibonacci systems, can be applied to both variants. However, due to the lower house edge, European roulette is generally considered more favorable for players who use betting systems.