Why PostgreSQL is better than other commerial softwares?

Hi,

I'm using FreeBSD and PostgreSQL 6.4. I tell my advisor
to try PostgreSQL, but he said:"Why PostgreSQL is better 
than other commercial softwares? If you could give me
ten reasons, and I will give it a try."
Would anyone tell me what's reason you like Postgres.
Because it's free, powerful and have others, thanks.

-Albert.

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