Get the
Brierley guide, it was very helpful on my two Portuguese Caminos. Most of Portugues speak reasonable English, you don't need to worry about communication, and most of it will be in the albergues anyway with the international crowd. Don't swap it for the French way unless you specifically want to walk it, the Portuguese way is self-sufficient, easy and VERY safe to walk, with great infrastructure, beautifil towns on the way, great food and the wearther in May should be fabulus, the way is very well marked. I started my first day of my first Camino there exactly a year ago to the same day! Grand memories! You can try both ways actually, if you walk the first day out of Porto along the ocean to Vila do Conde, great albergue there, then you can join the central way to Rates/Barcelos, plenty of people do it, you can find company for Barcelos if you ask around in the albergue. I walked without any gadgets, no internet on me, used the guide only to find a place to crash for the night, impossible to get lost. If you decide to continue along the coast the sprigy wooden boardwalk is not always there, some cobblestones as well as on the rest of the Portuguese way, some road walking as well. Bom Caminho!