Would Co2 Fractional Laser Help my Acne Scars or Rather Saline Injections or Subcision? (photo)

I am trying to decide which procedure I should undergo for my acne scars, I've already had 4 fraxel treatments only on my cheeks, that caused fat loss, hollow cheeks, which the doctor then tried to correct with fillers and subcision (3 treatments) I was not entirely happy with them because filler did not distribute evenly and created bumps that thankfully dissolved with time, since they were temporary. Would co2 fractional laser help, or saline injections with subcisions? Any suggestions?