Not going to fault either, both are useful in their different formats. For a beginner, I highly recommend Murray's format for it's simplicity and ease of use. Remember Dragnet? "Just the facts please". Nothing fancy, but straightforward. Think Honda Civic.
David's book is a work of art full of many insights gained through years of experience and data gathering from top collectors in the country. Still covers some basic information, but goes far beyond, especially with his comparative photographs of the many minute differences found within models and ranges. All this reminds me it's time to read Davids book again.
Both good, but Murray's is pretty linear and clear, probably the best choice for a beginner. But really, why limit yourself to one?
