If you get behavior therapy for your son, make sure it includes a component of training you on strategies to help him manage his anger and any other issues you are dealing with. 1:1 is great.... but you need to be able to follow-through outside of therapy. I believe a good therapist is worth their weight in gold. But not all of them are good.

one on one is the best there is no distractions because really a group, our children are already distracted enough

I agree with Jill Longenecker. It is worth your time. And yes you do have to follow thru with what the therapist is doing or it wont work. If you dont understand yourself ask questions.Cause in the long run it is all worth it.