Forum OpenACS Q&A: Response to If money grew on trees, which would you choose Oracle or PG?

If money and resources are no object then (IMHO) the client is almost certainly one who will feel most comfortable with Oracle.  So if it's a sales pitch you're after, it's a no brainer.  They may not *need* Oracle, but they'll feel better about that choice.

The only exception is if it happens to be a company that values OpenSource-ness;  then the technical questions of which is actually more appropriate come into play.  I think others have covered this well enough;  the only thing I would add is that AFAIK there are more and better add-on tools for Oracle to make programmer's lives easier, which in the long run is better for the client too.