I’m on my third Apple Watch. First was a silver stainless original watch. Then also added a gold aluminum watch (was on sale for $150 off. Couldn’t resist). Now using exclusively a space gray aluminum S3.
Both the Apple space black stainless steel link bracelet and the black Milanese loop look great with even the space gray aluminum. I have both for my SG alum. S3. Didn’t buy them just now though... got the SB link used for an amazing deal — no, not a fake — about two years ago and a 3rd party Milanese loop about a year ago. Wore both previously with the gold aluminum watch.
The Apple black nylon bands all look good with either black watch, and the black, gray and black Nike sport bands also look good.
The Product Red sport band also, I think, looks sharp with the black watches despite the silver pin on the back.
I’m not a big fan of the silver lugs on the Apple leather bands in contrast to the black watch, but they’re actually easy to swap out for third party black lugs if you want.
And of course there’s tons of 3rd party bands that look nice.