I now see that Julia's commented above, but before reading her thoughts I'd decided on the same two as her, numbers 3 and 5. Although I like the trig point in the first images, it somehow takes up the focus rather than the moor, dominating the landscape at the expense of the subject. And as you know, I'm a big fan of dramatic weather, (especially potentially lethal fogs!), and so number 5 speaks to me on that level. At least in my own experience, the raw elements are such an inescapable aspect of the moors that scenes like this are part of the allure, alongside the great sweep of heather in number 3.