No definate answer , but whatever you choose I would make sure that there is tracking availbale. Fedex and UPS all have it included, the USPS has it with an additional charge (.60 I think). The company I work for has found the tracking info very useful when trying to locate a missing package. Someone else just posted a chart on packages lost chart, maybe use the search button and see if that makes your answer any easier .
http://www.quiltingboard.com/posts/list/23705.page
went and found it for you Good Luck
Sharon