From what I've seen, it's the best of the 3 by far in gameplay and story. It adds at least 2 bossfights people wanted in the main game and expands on those characters. The final boss is satisfying and the alternate ending boss and story is fucking amazing (That is my personal observation).
I do hope future updates follow up on the alternate verse in some way, especially since alternate timeline stuff seems to be important to FFXV, as other people have said in this thread. Hell, id like them to clarify the main games ending a little more too if they could. This looks like the best addition so far.
Here's to another year of actual updates and DLC!