Major difference between MEB and Percona Xtrabackup

Can some one let me know what is the major difference between the MEB and the Percona Xtrabackup , i am in process of using the Percona Xtrabackup

Probably the most major difference is that MEB is closed source available only for Oracle Enterprise buyers. Percona XtraBackup is free and OpenSource software.

Functionality wise what are the advantages with Percona xtrabackup compired with MEB