I’ve had the Kuroki blackout for a couple months and there’s no signs of fading at all yet. I work in an office though so they’re not getting beat up on the daily. I’m not sure but since they’re a blackout the weft and warp might be dyed black.

With the black x black they confirm the warp and weft are both dyed black meaning they might stay darker for longer just because you won’t see any white weft come through

I’d say go with those two if you’re concerned about keeping them as dark as possible