I've had three great therapists with three different sets of credentials, but I will say my current therapist with higher credentials and more training does do deeper work than the other two did and in a markedly different way than the other two. Not sure it has anything to do with the credentials (I do think his training is a big factor), but it "feels" like a broader scope of knowledge and skills which probably is due to his focus during his education and training if I had to put a finger on it. His skill set appears to be much larger.