Doing a Camino route for the first time, and you need as much information as possible, in as concise a format as possible. So, DO get the FULL
Brierley Guide for the Portuguese Route. This will provide the full information you need, as well as a step-by-step map guide. He also has online updates available on his web site. Check this before you depart for Portugal. The web site is in the printed guide.
I usually bring the guide book, even if I have done the route previously. There is always some nugget of information I find that I need that comes more quickly to hand in the book, than by electronic means.
I believe there is a valid place for both a printed guides, and smart-phone app-based information. Among smart phone apps, the Wise Guides are among the best, IMHO. Many of the Spanish speaking and reading pilgrims use the Spanish language guide available at:
www.Gronze.es.
As regards printed guides, there are many. Ask five pilgrims and you will likely get seven or eight answers. But IMHO, for a first timer, the
Brierley Guides are among the best, albeit slightly heavy. They have downsized them recently to reduce weight though.
I hope this helps.