There are a number of good, objective, and informative comparisons
available on the Internet, such as http://www.databasejournal.com/sqletc/article.php/3486596.
You can Google something like "Postgresql mysql firebird comparison" to access
these. I am migrating an application from Paradox and took quite a while
to review the options before settling on PostgreSQL. I am in the early
stages of the migration and so far, I have not been
disappointed.
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