An example, Oracle has global unique index when a table is partitioned, Postgres doesn't.

Again, I haven't worked with OracleDB at all, and my postgres knowledge is limited, but assuming without having experience with both systems isn't fair to either DBs IMO.

Every large database vendor forbids public disclosure of benchmark results these days - ie Snowflake, you name it. Privately it's a different story obviously.

Streisand Effect. There must be anonymous benchmarks on the web somewhere.