I like the blue, but would choose the B cover as it puts the ship farther in the background. It shows up better.
I really like the blue. I find the color very soothing and easy on the eyes. a little less startling to me. I did my book in some of the same blue tones and found it turned out very nice. Check it out on Amazon. Deception Lies and Secrets. Just published.
The Yellow Orange depicts the way the sun glows in the morning then, the late afternoon . So cruising is efficient to your books coverage.
The blue tone is very becoming to both of you and looks very classy to me.