Range of adjustment: If you want an adjustable computer desk that has the facility to sit and stand, it requires to lower to the point where you are relaxed while working in a rested seating position. Depending on your height, the height of your chair, etc, this could be very low. And it requires you to go up to your standing work position, again depending on your height this can be pretty high. Drive Method: If you plan on actually adjusting your desk you need some way to move it up and down. Electric is the most comfortable for the user, and most complex technically.