I think the diffrence between Standard and Enterprise is not depend on the size of DB, there maybe some feature diffrence, but it's same using Standard and Enterprise edition of oracle database
Tere is some differences as it applies to oracle. Refer to this link: http://www.dba-oracle.com/art_so_oracle_standard_enterprise_edition.htm
We have about the same datadump excluding vaulted content as you do. Our database never run any better. Just make sure you put enough RAM to your allocated memory of your database. For us, we have:
We like the fact that all the alerts and oracle dbconsole tools are available in oracle enterprise with:
We were able to instantly send the SQL and find the origin of the issue to PTC when we had issues in Windchill 9.0. I really don't know if SQL Server can beat the performance of a Linux server with Oracle Enterprise. I just wish PTC supported Windchill on PostgreSQL which is free like Linux butsupported by a company like RedHat. I always find that Oracle DBAs have to know Windchill application in order to tune Windchill. Thus, these Oracle DBAs are specialized in Windchill.
Good luck,
Patrick