The compositions of the second and third are strongest, with my judgement leaning towards the second. Might benefit from bumping the mid-tone contrast to make the clouds snippier (USM 16, 60, 0) and dropping the vibrance and saturation somewhere between -10 and -20 each.
Photoshop vibrance and saturation layer adjustment terminology. I used to dig highly saturated colors for most everything, but it can be a little like eating too much candy - too visually cloying, sometimes.
