[Python] Which is better: using Django Constraints or raising a ValueError in the save method?

I’ve come across two ways to enforce a condition in Django models:

1. 
   Using the save method with a ValueError:
   
   class MyModel(models.Model):
   field_name = models.CharField(max_length=100)
   
   def save(self, *args, **kwargs):
   if not self.field_name: # Example condition
   raise ValueError("Field name cannot be empty.")
   super().save(*args, **kwargs)
2. 
   Using Django's Constraints (like CheckConstraint):
   
   from django.db import models
   from django.db.models import Q
   
   class MyModel(models.Model):
   field_name = models.CharField(max_length=100)
   
   class Meta:
   constraints = [
   models.CheckConstraint(
   check=~Q(field_name=""), # Example condition
   name="field_name_not_empty",
   )
   ]

I know both approaches can enforce conditions, but I’m wondering:

• Which approach is more efficient?
• Which one is generally better to use in real-world scenarios?

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