I was going to say Goldmont should be better, but now that I look, I don't see any Goldmont CPUs with a TDP that low. Airmont is also a bit newer than I had been thinking; I don't keep track of Atom generations like I do for the big cores. While a GPD with a Core-M would be pretty cool, it would also add a lot to the price tag.
Yeah the only reason I'm looking at the Atom now is because of the GPD Win and the Pocket. As far as price goes, the Win is a little bit more than I really want to pay for but I can manage it, but not if it was priced higher.