Looking for a new chair

The last couple of weeks I've been looking for a new chair to replace my SecretLabs Titan from 5 years ago.

My chair doesnt do it anymore, not confortable and almost every time I leave my body hurts.

I've been looking for Sihoo and Hbada ones, not knowing what to choose and not knowing if those brands are worth the money.

I was looking to spend 300-400 Euro.

Thank you in advance!