I like the third from the right. It’s a classic medium brown - not too yellow or too dark or too light - and looks great with walnut.

WIth darker brighter blue as the "color" in the room I would choose the second flooring. I think you will have nice contrast with the lighter flooring and the lighter, warmer color will complement the blue nicely. The first may feel dark and a bit muddy or murky next to a bright blue.

I personally wouldn't want to have this much variance, but it isn't because it is too busy, just too busy for me - I am adverse to busy anything.

I vote for the 2nd option. Great contrast!

Desk, bar counter and beams, go dark. The last two will look great on it.