If you use a form component, where is it better to specify constraints?

Question

symfony

There is a variant of the task of constraints, validation rules in the entity itself, or when creating a form.

/**
     * @var string
     *
     * @ORM\Column(type="string", length=255)
     *
     * @Assert\NotBlank()
     * @Assert\Type(
     *     type="string",
     * )
     */
    private $firstName;

или

 public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('firstName', TextType::class, [
                'required' => true,
                constraints' => array(new NotBlank()....))
            ])

Answer 1

I chose the first option using annotations. If you choose the second one, the buildForm function can turn into an analogue of "code noodles". The second minus of the second approach is arrays within arrays.
In general, as I understand it, it's a matter of taste.