Here's my take, take it for what it's worth, which is nothing.
I've owned a few micros, Halios and Aegir had nice offerings. I still have the Bluering, and as a matter of fact, might now be the watch I've had the longest. Most micros to me are pretty close to being fashion watches. I think Halios and definitely Aegir avoid this by not being basically designs picked from a catalogue. The Helson was a solid watch, but didn't really offer anything beyond that. Doxa is tricky, I think their main sales avenue is the web, so maybe a micro though they are owned by Walcha? I like the design of the Doxa, but the bracelet just felt and looked cheap. I'll have to try one of the new beads of rice bracelet sometime.
Then the next level up are independent/boutique brands which are low production similar to micros and sell online and might have an AD or two. They fill a niche. The Kobold is from a few years ago and is a solid great looking watch in my opinion. I think in general Kobold makes some good looking watches, but their QC and customer support has gone down the drain, so I stay away. Maybe Sinn and Damasko belong in this group, but I'm not so sure. Damasko in particular has an in house movement, but then again, so does Steinhart, or so they claim.