Well I think a lot depends on what you actually seek in a guide book.
I used the
Brierly guide for walking the CP (from Porto). It was okay for me and I never got lost. However, he uses a lot of words and describes many expensive accomodation options that I do not really need. I also do not really need his reflections. I do like to have a lot of background information (history, culture) on the villages and towns that I am passing, and the
Brierly guide has lot of this. I think there is also a a short version of the
Brierley guide, containing just maps and brief walking descriptions. I did not use this version, but I suppose it will get you to Santiago as well.
You will probably get some different outspoken opinions by others (this always seem to happen when discussing guidebooks, particularly
Brierly).
PS I saw
Brierly a couple of times during my camino portuguese, he was apparently there to update his guide. I never saw him walking though, but he could regularly be seen enjoying a glass of wine, or having lunch, or dinner.