Which is better for treating facial pimple scars Ayurveda or Allopathy?

Allopathy just means “normal” mainstream medicine. This means following your doctors advice and if medicines are in order they would most likely be synthetic chemical medicines.
Ayurveda is an ancient Indian system of medicine. Most remedies are changes in diet, or lifestyle, or herbal remedies. If you are looking into herbal remedies, I recommend looking into multiple herbal traditions, and not just one. This page may help you out with with ayurvedic acne solutions.

Remember that ALL substances, even natural ones are chemicals. Herbal medicines have side effects and interactions as well as synthetic drugs.

Laser therapy is the fastest way to treat acne scarring.

I use this natural lightening cream. It works very well, and it doesn’t have any harmful chemicals in it.