I guess the OP is possibly by now wondering what to do after two million different opinions :)
For touring with light loads on roads in Europe a 700c carbon bike will be fine, just keep an eye on it so it doesn't get manhandled or bring it yourself.
For heavy loads/crappy roads or far away places, steel with 26" wheels is still the touring consensus. You pay for that in a heavier frame/rims, but people on tours generally aren't in a big hurry to get anywhere :)
I guess the OP is possibly by now wondering what to do after two million different opinions :)
For touring with light loads on roads in Europe a 700c carbon bike will be fine, just keep an eye on it so it doesn't get manhandled or bring it yourself.
For heavy loads/crappy roads or far away places, steel with 26" wheels is still the touring consensus. You pay for that in a heavier frame/rims, but people on tours generally aren't in a big hurry to get anywhere :)