I just read a professional review of the 2 methods that stated in final conclusions:
“Perhaps no two methods of physical therapy treatment for low back pain are so contradictory in both theory and practice”
In my case I feel better with extension while I am flexion intolerant.
I am not into working through pain while any small sharp pain trigger a long term flare-up that will prevent me to keep my job.
Anyhow PTs are very much divided also.