Bevy makes it much easier to write reasonably fast, easily maintained, refactorable code. It's great for situations where you have a lot of complex logic, want to do something particularly weird, or require a lot of non-rendering performance (Unreal still crushes us on rendering performance due to several decades and billions of dollars of investment).

Factory builder and simulation games are the classic example of "when should you use Bevy". You should absolutely pick Godot right now for games that are more content-focused that need a lot of level design: puzzle games, platformers, walking simulators...