I have several scars on my face. Would a Fraxel treatment be best, or do I need something different?

I have acne scarring and was wondering which laser has the best results, Fraxel or Erbium laser. I don't want to spend a lot of money on repeated treatments, so which requires fewer treatments and is more effective?

How are they all different and when should one be used over the others?

Hi, I have lots of rolling scars on my back from cystic acne many years ago. I would like to know if Fraxel repair is the way to go. If not, which treatment would give me the best results?