The Talmud (ש"ס) can be broken down into two main categories: The pure legal content known as Halacha (הלכה), which includes definitions, sources and explanations of the law
and Agada (אגדתא) containing discussions of philosophy, ethics and metaphysics.
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Only 16% of the talmud is agadic, the vast majority being focused on the law.
Out of all the volumes in the talmud, Taanit (תענית) discussing the laws of fasting, and Sotah (סוטה) discussing the laws of suspected adultery, have by far the most agadic content, both with nearly half their content being non-legal.
There is minimal agadic content in any volumes relating to Kodashim, which deals with the services within the Temple in Jerusalem, its maintenance and design, the sacrificial offerings that were offered there and related topics.
Volumes relating to Taharos, dealing with Purity, have no agadic content.
Nashim or family law volumes in general have low agadic content, with the exception of Sotah mentioned above.
The same can be said of volumes relating to Nezikin, damages.
On the other hand volumes about Moed, laws of the Jewish festivals, in general have much higher agadic content.
And Brachot, discussing the rules for Prayers and Blessings, comes in decently well at 6th place overall.
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