Acne Scars Dermabrasion Didn't Work! Now What?

The doctor that performed the dermabrasion was upset with the result as I was. I feel he hasn't done this procedure enough to get the technique right. He is offering me another one free or Erbium laser. The first dermabrasion didn't work and results are user based, would doing the erbium be my best option? If the first results were disappointing, chances of the second dermabrasion I feel would be similar.Would Erbium laser be as good as a dermabrasion (results) or similar to fractional lasers