Apples or Lawn Furniture? Baseball or Lawn darts?
You're comparing two games that have very little in common.
Fallout for is a single player, open-world/sandbox RPG. Whose action is largely menu-driven, and what isn't is pretty clunky.
Destiny is a MMO-FPS/RPG...that tends towards playing more as a loot-driven Action-RPG than anything like Fallout.
If you want to compare Fallout to anything, compare it to Witcher 3 or Dragon Age.
If you want to compare Destiny, compare it to Borderlands, Diablo 3, or DC Unvierse Online.
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I get that they are very different games. However there are still things that are in common. One of the games are for casuals. The other, not so much.