A gaming chair is just a cheap office chair with the color schema of a kid's car seat.
The best gaming chair you can get is therefore an office chair, and there are plenty out there. I used IKEA chairs for quite a while, as they're quite reasonably priced.
And as an aside, if you're lucky and know the right people: The best office chairs are wheelhouse chairs from ships - They have to be comfy enough for someone to sit in comfortably for 12 hours, while being duranle enough to tolerate yhis for years. You just need to attach a wheel base. These chairs cost a small fortune, so the best approach is to fine someone decommissioning an ROV ship or similar where there's a 24/7 control point somewhere that needs to be removed. A former coworker of mine lived close to the yard we were worling, and he ended up with a home office chair costing more than our annual paychecks combined.