The only "ergonomic" chair I've ever like is another chair by Capisco's designer, Peter Opsvik, called Balans, now made by Varier [1]. It's a kneeling chair that rocks and supposedly forces you to exercise your core and maintain a good posture. It's fairly expensive ($400) for such a simple piece of wood, but you can find cheaper used ones on eBay.
Opsvik designed some crazy chairs. My favourite crazy chair of all time is his Globe chair [2]. The Gravity Balans is also weird, but probably great.
[1] https://varierchairs.com/product/variable-balans/
[2] https://www.ignant.com/2015/08/27/globe-furniture-by-peter-o...
[3] https://hiconsumption.com/2013/03/reclining-gravity-balans-c...
The nice thing about Capisco is there are quite a few ways to sit on it so you end up using different muscle groups during the day rather than constantly using just one. You need a height adjustable desk to pair it with this chair.