Which initialization method performs best

Development Programming & Scripting
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1

hello,everyone.
I’m confused about which initialization method performs best.I wish I could learn something better
for example:

struct FDog
{
  FVector Postion;
  double Health;
}
// example A:Initialize variables
void FunctionA()
{
  // MethodA
  FDog DogA{FVector{0.f, 0.f, 0.f}, 100.f};   
  
  // MethodB
  FDog DogB;
  DogB.Postion = FVector{0.f, 0.f, 0.f};   
  DogB.Health = 100.f;
  // Which of the above initializations is better?
};
// example B:TArray Add elements
void FunctionB()
{
  // MethodA
  TArray<FDog> Dogs;
  int8 I = Dogs.Emplace();  
  FDog& DogA = Dogs[I];
  DogA.Postion = FVector{0.f, 0.f, 0.f};
  DogA.Health = 100.f;

  // MethodB
  FDog DogB{FVector{0.f, 0.f, 0.f}, 100.f};  
  Dogs.Emplace(DogB);
  // Which of the above initializations is better?
};