the best gaming chair is the one that feels best to you.
you will be in contact with the chair more than any other part of the PC. constant contact. go out and plant yourself in as many as you can. find out what is best for you.
little things like the arms being too high or too low will make the chair sub-optimal.
the best gaming chair is the chair that lets you game comfortably, be that a big yoga ball, or a la-z-boy.
I cannot tell you what is comfy for you.