Having now read all three volumes of Batman Black & White, I feel it's safe to say that this is the strongest of them all. The writers and artists in this collection take the strongest advantage of the short story length, focusing often on one new or otherwise minor character and telling a very brief, personal story, or just using the visuals to punch out some really quick, compelling superheroics. Still, the volume is dragged down by an overabundance of boring, mediocre, and sometimes atrocious stories that make you wonder how they even made their way past the editing phase. Also, after reading all 3 of these volumes, it's pretty nuts how many of the exact same themes and setups are used (specifically, there were seemingly 500 stories just about Batman losing it due to Scarecrow's fear gas). I think this speaks to Batman as a whole, and also serves to highlight those stories that sought to eschew those tropes for something truly original.
As I've done with the other volumes, here are my favorite standouts in this collection:
The Call (Mark Schultz & Claudio Castellini): A thoughtful, well-considered snapshot of Batman's unstable relationship with Superman, with great art to match.
The Lesson (Julius Schwartz, Dan Raspler & Christian Alamy): A genuinely surprising and emotional look into the Batman mythos. I don't want to say much more because it deserves to be read without pre-commentary.
The Bottom Line (Michael Golden & Jason Pearson): This is probably my favorite story in this collection, and yet it features almost zero dialogue. Pearson's art does all the work here, seeming to leap off the page with life and motion. It's like reading a finely-animated film, full of action and tension.
Last Call At McSurley's (Mike W. Barr & Alan Davis): I loved this one, which takes perfect advantage of the common trope of Batman beating the hell out of people in a bar to get information. It's repetitive, but on purpose, and the ultimate payoff of the story is both funny and nostalgic.
Punchline (Doug Alexander & Rob Haynes): Another story told almost entirely without dialogue, this one has a great sense of humor and lives up to its name.
I'll Be Watching (Ed Brubaker & Ryan Sook): A small-scale, personal story of an ex-con that somehow perfectly exemplifies the Batman mythos, despite barely showing him. Really superbly drawn, as well.
I wish I could create my own personal Batman Black & White collection that just contained the stories I truly loved. I'd be more than happy to own something like that, but as it stands, the quality is just too all over the place to justify purchasing these kinds of things (unless you have a ton of free shelf space or something). So, worth checking out if you have it for free or something, but don't go out of your way.