Simone, I like the second. I particularly like the differentiation of tones among the clouds. They are a bit more compressed in the first. The bright patch of sky at right, beneath the clouds, is also a little more burned out in the first (may be exacerbated by the jpeg conversion for display here). I also like to see into the shaded, darker tones of landscapes, and often process to lift and separate the darker levels. That can lead to lower contrast overall, which I don't mind, but is not to everyone's taste. Cropping to a more panoramic aspect ratio might emphasise the horizontal elements in the sky, but my preference would be only to trim a little off the bottom. The mountains stand tall, and some of that is lost for me when I look at the picture with their feet chopped off. See what you think. Beautiful image. Print large!