First one as its the latest
Symantec_Endpoint_Protection_11.0.6_MP1_Xplat_EN_DVD.zip
Second one is still available for people who are upgrading from lower version say 11.0.5 they cannot directly upgrade/Migrate to 11.0.6 MP1
they will 1st upgrade to 11.0.6 then to 11.0.6 MP1
However for you, You can directly go with RU6MP1