I know people who walked Camino. I've heard it can be grueling because it is unshaded. Also, the trail is often near modern roads, making it anything but scenic or peaceful.
The pros seem to be: it's a foreign country, there is actual lodging, and for many it's a religious pilgrimage.
I hiked parts of the Appalachian Trail and loved it. New Hampshire is beautiful and offers the hut system (a bit expensive) for people who want a roof and bed.
I've done parts of the Camino. Don't remember specifics, sorry. It was about 20 days worth. It's not about communing in Nature, although if you do the "northern" route, like I did, there are more stretches of solitude. The Camino was definitely about meeting locals along the way, and other pilgrims. By the end, it gets really full of pilgrims, you'll hardly be alone at all.
For me it was amazing being apart of something so huge and bigger than me. Walking a route that pilgrims have walked for 1000 years! Imagine how different the world was then, it's amazing a tradition has held on that long. And there's a camaraderie that forms, even between you and the locals. Think about the people who live along the route: for as long as they've known (and their parents, and grand parents, and great grand parents) pilgrims have been a part of their life. It's like you become a part of the landscape as a pilgrim, or a part of the fabric of the place, even though you're a foreigner. The albergue at the end was huge! Like 100 beds in one room huge.
I also enjoyed just being in that part of Spain. It was so...English. Not really, just what I think of as English, and it makes sense since the Camino is along the Southern border of the same sea that touches England. Nothing like Southern Spain where I had just spent a year abroad.
Anyway, I've forgotten the original question. If you're still debating, you MUST do it!
ETA: oh, you want to know which segment to do. Again, I'd recommend the Northern route...there were roses and thatch roofs, and lots of solitude. There was a city with a big castle which was neat...can't remember what it was called though!
