FedEx Express Saver and FedEx Ground are simply two categories of shipping solutions FedEx offers.
FedEx Express Saver
Time-definite delivery to 210 countries in 24-48 hours. It is faster and you can decide the time of day it will arrive. However, this does cost more. FedEx carrier packaging is available for use with this service.
Cost-effective delivery in 1-5 days to the continental United States and 3-7 days to Alaska, Hawaii, Canada, and Puerto Rico. While it is inexpensive, you cannot choose the time of day the package will arrive nor does it arrive as quickly as with FedEx Express Saver. FedEx brown packaging available for use with this service, however the white carrier packaging is not.