The most advanced micro textbook is Microeconomic Theory by Mas-Colell, Whinston, and Greene. It is the standard graduate textbook.

Macro is going to be somewhat more controversial. I’ve never heard of the Gali textbook, but my program was very opposed to Keynesian thinking. While I’m obviously not a fully unbiased source, based on glancing at what Amazon would show me, I would argue that the Gali book is not the most advanced textbook, because the math used looks too simple. On that basis, I’d argue for Recursive Methods in Economic Dynamics by Stokey. Lucas, and Prescott.