mysql vs postgresql

We're going to build up some dynamic pages here, and right now we're using
postgresql
and som php that a consult made for us.

My question and wonders are;
They say here and there that MySQL i _alot_ faster than PostgreSQL on
SELECT-queries.
Convince it isn't. Or convince me i should use PostgreSQL.

We'll mostly have 'exam-tests' with questions/answers, and of course login
before you
do the test.

Is there any good compares between mysql/postgres and maybe ms-sql or
something?

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