Which bone graft is better? is it better to use bone from your hip, or the cadavers bone?

Depends: It depends on the extent of defect and what the dentist is trying to accomplish. The dentist can always obtain autogenous bone intraorally. Also cadaver bone has been shown to be very effective in treating most bonegrafting needs for purposes of creating bone needed for dental implants. I personally feel using bone from the hip is too morbid for the patient.

Your own: If it is medically possible, using your own bone is the best, but there is a risk in any additional surgery. We routinely use cadaver and synthetic bone in our practice.

Defect size: Based on your question, i would assume that your specific situation requires a significant amount of bone, since your doctor is considering a hip bone graft. Good results can be achieved with different bone types, including cadaver bone. However, the larger the defect size, generally better results will be achieved using your own bone.