Bestiary 3 rules! And let me give you one simple (if somewhat lengthy) reason why.
Some couple years of so ago, I saw a story through some news outlet of a paleontologist or archaeologist or some such in Australia who had found some remains of a relative of the kangaroo. These kangaroos had thicker, stronger bones than the ones we see nowadays, indicating bigger, stronger musculature. They also had claws. And fangs. Now, the discoverer of this news was a bit heartbroken to see such a nasty variation of the peaceful kangaroo. But I am a gamer, so my reaction was, "Cool! Kangaroo with the Dire Animal Template!" But alas, this idea was of no value without roo stats to apply the DAT onto. I have been planning ever since to do some research on kangaroos to create that write-up on my own.
But Bestiary 3 has saved me the trouble! Behold the glory of page 191 -- "Marsupial, Kangaroo"!!!! And now the packs of Dire Kangaroos can run amok upon the players who have me for a GM. Wonderous, it is wonderous, I tell you.