The brass look in line with your taps and I find the black is hohum.

Not enough context.

Over what vanity, what size? What location are sink centers? How high is ceiling.....Does it NEED to be oval. ? Etc....

The frame of the mirror is so thin as to be nearly invisible. IMO that will help eliminate the difference in finish between the mirror and faucet.

not black

I have different "golds" in my master bathroom and it looks fine as long as the golds complement each other. I guess an extremely OCD person might not be happy with a slight difference, but they aren't using my bathroom!

What are the lighting and hardware metals?

Between satin brass and black, I would decide based on whether you want the mirror to join the warm-metal story or create contrast. Since your faucet is satin bronze, satin brass does not need to be an exact chemical match to still look intentional, especially if the undertones are both warm and the room has other bridging materials.

Black is safer if the brass version reads too yellow against the faucet, but it will make the mirror feel more graphic and separate from the plumbing. From a manufacturing and QC perspective, mixed warm metals usually work better than a near-match that misses in undertone or gloss.

If you can, compare the mirror finish against the faucet finish in the actual bathroom light before deciding. That usually tells you more than online photos do.

Between satin brass and black, I would decide based on whether you want the mirror to join the warm-metal story or create contrast. Since your faucet is satin bronze, satin brass does not need to be an exact chemical match to still look intentional, especially if the undertones are both warm and the room has other bridging materials.

Black is safer if the brass version reads too yellow against the faucet, but it will make the mirror feel more graphic and separate from the plumbing. From a manufacturing and QC perspective, mixed warm metals usually work better than a near-match that misses in undertone or gloss.

If you can, compare the mirror finish against the faucet finish in the actual bathroom light before deciding. That usually tells you more than online photos do.

I would go with the 1st mirror, instead of flat black, even if they do not match exactly. The faucet in the attached photo (taken at an open house) is Brizo, not Cal Faucets, but similar in color to the finish that you chose.