Destiny 2's Edge of Fate campaign lets you pick Normal or Legendary difficulty, each affecting your gameplay and rewards.
Legendary mode is tough but gets you ready for harder endgame content like raids, plus you might earn awesome new armor.
Normal mode is a chill way to experience the story and visuals, but you'll level up a bit slower for endgame.
So, think about what you want most: a challenging start in the endgame or enjoying the story at your own pace.