Both treat musculoskeletal pain, but their approaches differ.
Osteopaths focus on the whole body, using a wide range of techniques including soft tissue work, joint mobilisation, manipulation, stretching, and lifestyle advice.
Chiropractors typically focus more on spinal adjustments.
Osteopathy tends to be broader and more holistic, tailoring treatment to your overall movement, posture, and daily habits. However, this is very generalised, depending on your practitioner you may get a more holistic Chiropractor or more adjustment focused Osteopath. The best thing to do is to enquire about the treatment styles of the practitioner you are interested in seeing.