I've not been actively keeping the site up-to-date. I merge PRs every so often, but I'm not following Reddit/Discord/etc to add new keyboards.
https://ultimatehackingkeyboard.com/ (my personal favorite)
https://keeb.io/products/cepstrum-keyboard-pre-built
https://keeb.io/products/quefrency-keyboard-pre-built
https://keeb.io/products/sinc-keyboard-pre-built
https://dygma.com/pages/dygma-raise-2
https://www.keychron.com/products/keychron-q11-qmk-custom-me...
But before that I bought all the non-ortho splits (Kinesis, Goldtouch, etc.)and keeb.io were by far the most versatile. I recommend Quefrency for compact layout (my fav is V3 where you could still customize the bottom row) and Sinc for regular size. I used Quefrency when traveling and Sinc in the office. Happy to answer any questions!
They're also comparatively better priced than others of its kind.
The Microsoft Natural keyboards were an ergonomic nightmare. The cheap, sliding post keys would have varying resistance depending on how close to the center your finger landed, and how vertically you applied pressure.
Also, the keys were arranged over a hump. The dished design of a Kinesis has much better ergonomics.