I would hate for a bunch of Physio to comment on the differences here. Perhaps someone should redirect this to the fundemental differences between a manipulative physiotherapist (only a small part of the physio profession) and an osteopath. It might be better to understand the differences in approach between a chiropractic philosophy and an osteopathic philosophy as the former grew out of the later.
The courses and practitioners are so varied depending on the country that this comparison is difficult. Also this is a forum for discussing topics on physiotherapy, not opening up what could be a pandoras box on the pros and cons of osteopathy vs physiotherapy.... 8o