We actually have had this discussion before on this forum. You cannot compare even on the application of a rehabilitation technique as the technique in itself is not the major component in a rehabilitation plan! It would be like comparing a junior athlete to an Olympic champion. Excuse my rather opinionated answer. But there is nothing to compare.
A sports rehabilitator lacks the depth of clinical anatomy and disease process required to make the very best judgments on all sorts of injury mechanism. This is both at a high level client (e.g. professional athlete and at junior level e.g. a young male with Perthe's diesease). Disease being a major factor and the identification of both red and yellow flags as well as identification of serious pathologies (e.g. tumors) that must always be considered.
Now outpatient physiotherapy practice is but a minute part of the physiotherapy profession which includes, neurology, cardiac rehabilitation, cardiopulmonary medicine, paediatrics, gerontology, mental health, developmental disability, wound care, plaster application, various respiratory suctioning and supportive breathing techniques including working in the intensive care units etc etc.
So comparing the two is no better than comparing an Osteopath to a Physio. You can only compare on the skill level of the components in the Sports Rehabilitators remite that are also used in the Physio Profession. In that regard there are some very good practitioners on the rehabilitators side. In Canada we always had Athletic trainers as part of the staff as they were very proficient at carrying out the rehabilitation plan that was developed by the physio team. This is where the issue lies. You might be very good at teaching a specific exercise and also at encouraging the client but most of these courses lack the reasoning behind what exercises should be given and when. For this you need a team approach.
I am sure of course not all will agree with my comments but this is what a healthy debate is all about