I have had Instructor training by both RTITB and ITSSAR. I have found that the mentality of ITSSAR teaches you to never give up and try your very best to get the trainees through the course, give second chances. RTITB I have found to be more stringent, you provide the necessary information to pass the course and basically if they dont deliver, they fail. Having experience from both of these accredited bodies I think that the training I deliver has a fair balance between the two.