If you're looking for a leather band, I highly recommend Form Function Form's offerings. Another forum member suggested this and I gave it a shot. The design is simple, yet outstanding, the quality is superb and the customer service is absolutely top notch. They will replace the band if there's any problem with it. Follow their sizing guide and you're golden. The location of the stud makes this band so incredibly comfortable to wear.
https://formfunctionform.com/product/button-stud-apple-watch-band/
I don't have space black, but a space gray aluminum and have it paired with Alpine Gray Suede and also Russet Chromexcel Natural. Both look great.