I’m still trying to get good info of coast vs central caminos (and have read the other threads which don’t fully answer my question)… It seems the central Camino goes through more industrial areas, and is more along roads, but is more full of historical towns, and also busier… while the coastal Camino is less busy and along boardwalks and the beach? i think I may combine the two by walking out of Porto along the coast until Camhina and then taking central route? Any thoughts on this? I am not a fan of roads or traffic or industrial areas, but I am a history buff and like charming old towns… Am I missing those if I take the coastal until Caminha? Any tips, suggestions ans greatly appreciated!
This is a complicated question and you're going to get a lot of opinions on each side. Having walked the coastal twice and part of the Central once (Porto to Ponte de Lima), I can offer a few general comments:
1) From a pure walking point of view, the coastal is much easier, hands down. On the coast it's mostly flat while you do get some elevations on the Central. Also, some of the road walking is a bit hairy on the Central, from Porto up to about Mindelo.
2) In terms of historical towns, Central definitely has the edge, with Barcelos, Ponte de Lima and Valença. Ponte de Lima earns my vote for most charming town in northern Portugal; we spent several days there to enjoy some local festivals. There's also the 12th century D. Zameiro bridge over the Rio Ave just south of Vila d'Arcos. Of course, you can find some interesting things on the Coastal as well, like the Celtic excavation site near A Guarda and the replica of Columbus' ship Pinta in Baiona harbour (you'll be amazed at how small it was). I also like the older waterfront parts of Vila do Conde and Viana do Costello; very scenic.
3) In terms of natural scenery, it's a bit of a toss-up. Do you prefer ocean or mountain views? Beach boardwalks or forested trails? This is purely a personal preference thing. My wife emphatically prefers the coast and I'm okay with either.
4) "Pilgrim ambience." I put that in quotes because it's kind of hard to pin down. But basically I mean that sense of being on a medieval-like pilgrimage, or quest. You might argue that the coastal is a bit weak in that because, frankly, you're walking through so many modern beach resort towns, particularly on the Portuguese side of the Minho. On the Central, we found we tended to bond more with fellow travelers, there was just more, well, pilgrim spirit. This is such an intangible thing that I don't want to make too much of it but there it is.
As for deviating to the Central route after Caminha, you can easily do that. There's a very nice wooded trail along the Minho that takes you up to Valença (where you can enjoy the historic fortress, which was so easily taken by French troops during the Napoleonic Wars). But then you miss a lot of good stuff from A Guarda up to Vigo (and also the very scenic trail along the estuary from Vigo to Redondela, where you meet up with the Central).
It's a tough decision any way you look at it.
Boa sorte!