Some features are mandatory for a good chair regardless of how you intend to use it:
Adjustability - Check to see that seat height is adjustable.
Seat height range - Check whether the seat height can be adjusted to the height recommended for the worker(s) who will use it. Other chairs may have to be selected for very short or tall workers.
Backrest - Check to see that the backrest is adjustable both vertically and in the frontward and backward direction and has a firm lumbar support.
Seat depth - Select the seats that suit the tallest and the shortest users.
Stability - Check for the stability of the chair; a five-point base is recommended.