PostgreSQL vs MySQL: Are there tests on large tables?

Already from the 10th specialist this year I hear that it is time to switch to PostgreSQL :-)
Habralyudi, share the real experience of using PostreSQL on databases with tables of 30 million records and more.

If not, I plan to do it myself soon, but I would like an objectivity.

PS In versions of PSQL to 7.x - 6 million records caused a big problem.