Disclaimer: huge postgresql fanboy, use it whenever I get the chance

A few things I've found great in Oracle that aren't (AFAIK) available in PG:

    - Straight better/more reliable performance on average
    - More advanced parallel queries (obviously this is changing in PG right now)
    - Flashback queries
    - Better materialized views
    - Plan stability (maintains predictable query performance, rather than the nasty jumps you sometimes see when plans change)
    - Better clustering story (RAC is super expensive but pretty good)