It depends on how much and where you want to have corals and what kind as well. I like the look of the original B, but if it were my tank, I'd do A as it has more room for coral that I would use.
I just redid my rockscape and I did a lot more shallow and flat rock, many with 3/8" holes drilled in them to make frag plugs easy to place where I want them. You can see my rescape in my build thread (link in my sig below).
I have a question for the OP...if the group chose the one you didn't prefer, would use it anyway?
A
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B
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I wanted an open sand bed but there just wasn't enough room on the rock to mount all the corals I want. Nothing will go on the sand bed. In picture A there is a bridge but the green star polyp kinda blocks it in the pic.