I prefer to ship in a case with soft padding around the case. I have used UPS exclusively so far without loss or damage, however one box showed up soaked. (The instrument was OK.) I now wrap the case in a plastic trash bag inside the box. Also, I buy insurance mostly assuming that the tracking and care might be a bit better. These days, it is possible that the greatest danger is baking in a truck in the sun on a hot day. Resulting damage might be difficult to claim successfully.