It's certainly a matter of personal taste.
My choices are different from Stamper's (for the first time in my recollection).
My first choice is #1, since I am a fan of clouds and abstracts. This is the most abstract of the three.
My next choice is #3, which also has good clouds, and the foreground doesn't interfere too much.
As a sunset, #2 seems the weakest to me.
That being said, I'll still buy each of you a beer if I ever get to meet you in person!
-Eric