I learned majority of the materials covered in RC Bible from BP. Personally, when it comes to marking the passage, I think BP does a better job than RC Bible (way too much markings). On the other hand, RC Bible's analysis of each passages covered is impressive.
The book heavily emphasize their VIEWSTAMP technique, which I think is the most important thing that test takers should be aware of. I'm currently re-reading chapter 8 as it contains great information.
On the downside, I think they copy-pasted a good portion from LRB.