GD72, I don't think "travelling" as you have described it, should in any way qualify as being especially demanding. If it is, you're doing it wrong. Presumably, the thing is being carried in a backpack or other carry-on bag, and sitting on a desk in a hotel or an air-conditioned cabin on a luxury liveaboard is pretty sweet life for a laptop! If you worked as a war correspondent in Afghanistan, it would be different...
So really the question is which computer is best for Lightroom and Photoshop. The other apps can be run on a 5 year old smartphone, so they will run on anything that can run a browser.
Macs are universally accepted as the best machines for these graphics-intense apps. I use a Macbook Pro 15" with a dual processors and a SS drive. My only complaints are that they are stupid expensive, and the drives are relatively small. Otherwise, it's a serious kick-a$$ computer. As in open a 20 MB RAW file in 3 seconds, including launching Photoshop. Startup from a cold start is about 10 seconds (just tried it).
The SS drive very durable in my experience. So if budget isn't a killer you can't go wrong. (Incidentally, the 15" SS drive unit weighs about the same as the 13" older MB Pro. It is a bit of a pain to carry, but the Retina display is amazing.