there isn't a standard or premium edition for rhel-as. perhaps you are referring to the support options? unless i am mistaken, advanced server is only available with premium support, whereas enterprise server is available with either standard or premium support. it is my understanding that premium support includes phone and web support from red hat.
in any event, even red hat enterprise linux workstation includes most, if not all, of the packages available on advanced server (as far as i have observed; i have not made a package-by-package comparison).