Oregonian born and bred. I've fished all ends of the state for all species. I've lived in Portland since day one, except for the college years in LaGrande(God's country for sure). Have a home in Central Oregon and love it there. With all that in mind, and especially considering where your profile says your from, I don't see how you could drive past the Rogue intent on the other two. I've visited Forks and the OP but I wouldn't want to live somewhere where it rains MORE than Portland. And Tillamook area...NO WAY(love those Rivers though), see above and add flooding! Even if you go spend some time in either of those areas, knowing that Southern Oregon was on your list, you'll head back that way. The weather is the number one reason I'd choose S Oregon over the others but if your decision is strictly based on winter fish, someone might be able to talk you in to one of the others. Is this a retirement move or for a new gig? If it's retirement then S. Oregon no question. All the big city needs, and great schools and healthcare, but you're in the middle of nowhere in 15 min. MUCH better socioeconomic scenario around Medford/Ashland too, especially if you're after a new gig. Maybe Oregon isn't best due to taxes and that's where Washington usually wins but there's too many other +'s to list here. PM me if you want more of my opinion. Oregon is a great place period but it's not undiscovered anymore, the state continues to grow. Sounds like an enviable situation you're in, maybe? I want to move where the fishing is best someday but I already live there-can't beat Portland for that! Good luck finding your new home town.
JMHO
CA