I don't know of any way to compare wheelchairs available in one country to those available in another. Your best bet is to seek advice from a physician, a physical therapist, and an occupational therapist if possible. Wheelchair sales people are probably the LEAST reliable (in my experience). Also check to see what insurance/health care can provide help with. If there is any way your father can get a free trial period for the chairs that seem most suitable for him, take advantage of it.