I used Katzung for school, most of the time anyway - I definitely wouldn't recommend it for boards, as it's extremely in depth. I can't imagine covering the whole book - plus, the layout is not at all suitable for review or cramming; I like having a lot of lists and charts, and Katzung is mostly prose. I have baby Katzung too, but I still wouldn't use it for boards.
I used Lippincott for school sometimes, I liked it because of all the lists, charts, and diagrams. The only problem with it, was that there was often things not in it that would be on my exams. Also, it is annoying how they have the newer drugs in the "update" section in the back, and not together with their classes. At least that's how it is in my version. Otherwise I think Lippys is pretty decent if you don't have Kaplan and its organization works for you.