Zigzag 3 , Border B gets my vote.
Here's why: I like how the dark pink zigzags form a visual stairway "up" on the left and stairway "down" on the right.
Border B brings out the pale blue from the focal strip. (I'm not a fan of the pink border because it gets lost against the design. The first border--white only, if that's how I'm interpreting it-- is okay, too.)