What color Ikea Kallax?

Excuse the mess, was in the middle of changing sheets lol.

I'm planning on putting an IKEA Kallax shelf (as seen in the screen haha) in the area drawn. I'm wondering which color would work best. The black/dark brown one seems like it would match the rest of the furniture but may serve to further darken the room. The white one would brighten the atmosphere a bit which I'd like, but I'm worried it might not match the rest of the furniture. What do y'all think?

Any other suggestions or tips based on anything in the picture are welcome.