@Lowena, it's the centre block that's different.
If you do Ctrl with -, the screen will scale smaller and you'll be able to see both blocks at the same time. When you do it jumps out.
the version with the black and white in the centre shows up the colour symmetry because it creates a lighter zone and a focus point.
what will it look like when you have several blocks separated with sashing?
the version with the colour in the centre will give a more overall effect is you have several blocks separated with sashing.
I think you need to see a layout that includes more of the pattern repeat before you decide.