When I had my really troubled dog (55kg of people and dog aggressive dog) in the beginning none of the positve Reinforcement people would touch her. They all suggested PTS.
It was only a person who used some of both who would help........And I tried a lot of Behaviourists/Trainers. Local Vet Behaviourist and some in Melbourne and Sydney. Even some of the ones touted as the best, would not help.
Annabelle is now a really well mannered and even tempered dog. Very social and easy to get along with. So we counter conditioned her and we did have to use some well timed P+........But now she is trained very much R+/P-