A Over the past few years, I have been increasingly using cadaveric rib over donor rib. There is a lot of support in the medical literature that it generally survives and resorbs minimally.
Obviously, there is morbidity (negative effects) associated with an incision and a harvest, especially one that is visible on the chest wall. Other concerns, such as pneumothorax (air around the lung) are very small, as it is an extremely uncommon complication. Also, when you harvest a rib, it then has to be carved and the carving is difficult to do precisely. Depending on how it is carved, it may increase the risk of warping over time.
My preference has been to use cadaveric rib sheet. It is precut by the tissue bank in a perfectly straight piece. The risk of warping is significantly reduced by using the precut product. Most grafts, besides large dorsal augmentations, require thin and straight cartilage to work best (columellar strut, spreader grafts, rim grafts, etc.), so it is an optimal choice in my opinion.
For large dorsal augmentations, patient choice dictates the donor source.