I have done a lot of touring. Here are some thoughts, for what they are worth.
First, lightweight is not important. I think mid range stuff is best for touring, as it's stronger and more forgiving of poor setup.
Second, avoid bling if you can. Crappy looking bikes are less likely to be stolen.
Third, don't kill yourself on distance, and measuring. As someone who has returned from a sabbatical from cycling and the Internet I think the current trend towards recording everything you do with a smartphone is a mistake. It's not a race; if you find yourself only wanting to do 20 miles in a day on tour that is fine. If you have your head down all the time trying to stick to something you drew up on Google maps, you will miss roadside conversations with locals and interesting journeys down side roads.
Fourth, and last, boring technical bits. 36 spoke wheels, mated to good quality not gnarly tyres and conservative, stout rims are things to aim for. For tyres, 1.5" is a good size, but 1,75" is better. Mudguards. Service everything before you go and you will be fine.
Let us know how you get on! Either of your bikes would be ok, if you like them and think you can ride them all day. But I would get something cheaper, and bigger than you'd choose for offroading. Frames built before 1991ish are the best tourers. Mine cost £65 and looking in the classifieds here I can see at least three in the last month that would be ok.