While any counseling therapy for drug abuse treatment is better than none, group therapy is generally preferred over individual therapy. In group therapy, you’re more likely to be both challenged and supported by peers who are also going through drug rehab.
Twelve-step programs like Narcotics or Alcoholics Anonymous are also peer support groups. They can be a useful part of your recovery program. But keep in mind that they aren’t led by a trained psychotherapist and, thus, aren’t the same as group therapy.
Individual therapy can help when you have depression, bipolar disorder, or another significant mental health condition that requires treatment in its own right, separate from your addiction.
Group therapy has been a core aspect of drug and alcohol addiction recovery for several decades, and it has proven to be very effective.