For the “Stormy McLoughlin“, the 15 second exposure, the character was really in the clouds. Sweeping across the frame, each cloud was its own character. In the longer exposure, the textures disappear in the sky and water and give a sense of an oil painting.
A fun feel, but missing some of the texture.
Here’s a similar angle, with a different orientation, and with a much quicker exposure (1/40th second) to capture the character of the clouds and lake.
Do you have a preference? If so, what does it for you? What doesn’t do it for you?