Here's my 2 cents:
I haven't read everybody's book yet, but I have read Doug's (no, not the dirt track book - the Tube Amp Library of Information) and I've read quite a few other 'Bibles'. I'll say that the other Bibles generally fall into two broad categories: The Very Complicated and The Very Opinionated.
The Very Complicated variety includes RDH (yes, 3 is easier to digest than 4) and any other professional manual of the era. There's no better data anywhere - if I could just understand it.
The Very Opinionated variety includes nearly everything written since 1980 except for a very few. There is no "Ultimate" anything...
... except for Doug Hoffman, Richard Kuehnel, Earles McCaul, Paul Reid, and Steve Luckey. If you think Reid and Luckey haven't written a book, you haven't seen the huge archive I have of their stuff. I'm also favorably anticipating Merlin's book. I highly respect all of those guys and I unashamedly hang on every word they say. I am a better circuit builder, trouble shooter, and general amp guy as a result of teaching by those men. ...and yeah, I'll argue with them. How else can I test my own purely theoretical ideas? I have to make the most of the time I have while they'll still talk to me.
In the end, when I gotta get it done and I need to know the best way right now - which might be 2am - I hunt the answer down in Doug Hoffman's notes. I've totally adopted his layout style and philosophy. I haven't ran into a single situation where his advice or method has let me down - not one. For me, the Tube Amp Library of Information is by far the most dogeared, worn out, over read book I "own". One day, I plan to convert the whole thing to pdf, index it, and print it off so I can read it on the can!