Zuckermann is the bigger light-blue book.
Perry is the smaller white and maroon book.
I have heard good things about both but the residents I've spoken to overall seem to prefer the Perry.

I guess it depends on your program. Everyone at my program has Zuckerman, as did almost every resident at the programs where I rotated. I have it and think it is awesome. I have never seen Perry, so I cannot comment on it.