Use ghost attribute or method for custom output in model

If I'm creating custom output for my model should I use a method or a ghost attribute. Lets say my DB has columns first_name and last_name and I want to access them as fullName in my view. Which is better:

//Model
public function fullName()
{
  return $this->first_name . ' ' . $this->last_name;
}
//View

Or

//Model
public function getFullNameAttribute()
{
  return $this->first_name . ' ' . $this->last_name;
}
//View

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