I am having the same dilemma as well picking a chair for my WFH setup. I went to IKEA to try Flintan, Markus, Millberget, Langfjall etc.

Markus is comfortable except I hate the armrest material. Feels like a sticky rubber. And the headrest is too high for my height (I'm 165cm). Langfjall is the best but it is high back w no head rest.

Was reading LYN forum and look for other alternatives as well - Anggun, Steelcase.. but I have not tried them.

Next that I tried was Altercase chairs at their showroom. CG Prime mesh material and lumbar support is quite good, and I also like how easy to adjust the lumbar support, but the headrest is the problem again. Too high for me, even when set at lowest position. The SA there mention it is more suited for people 170cm and above.

Long story short, I ended up buying LIV 10 even though it is the low end range of Altercase. It ticks most of the boxes with the headrest suits my size and provide very good support to my neck. None of the DT or CG model can beat that (for my body).

Point is, when choosing chair, I think testing it out is the best way of choosing. If I just based on my reading, I definitely would have bought CG Prime. Despite its bells and whistles, I would still be disappointed as would not get good fit from the headrest.

Alterseat, with its showroom and friendly SA, really makes buying and choosing easier for me. Took me about 15mins to test out their ranges and decide. I really recommend going there, or any other showroom brand that you prefer to try out. That would help you by a lot to make decision and save a lot of time being in dilemma just by reading (like me 😂)