Except expedition touring, all kind of tours share the same things -- you are never far from a bike shop, hospital or a parts and tools supply store via Fedex or UPS and cell coverage.
Expedition touring requires that you CARRY ALL TOOLS and Parts, food and a satellite communication device with GPS relay (very helpful getting help when you're down) and knowledge of first aid and medication. Why? Because there are 2 things that stop you from touring. You being sick or the bike being broken. Typically, you'll choose a heavier and sturdier frame and wheels because that's the only thing you can not fix effectively by yourself.

Other than that, all tours are really the same. It's how you enjoy the tour that counts. Don't let some touring cyclists with this elitist attitude convince you only one tour is better than the other. I've met my fair share of cyclists who make rather childish immature comments that their tours are better than yours. Sort of like my iPhone is better than your Android. A tour that you most enjoy is the best, so being a hub and spoke is equally as good as an expedition trip across the Sahara desert or an ultralight on a carbon or sport touring bike.