A desk is the one piece of furniture you will touch every working day for years. It is worth ten minutes of thought. Here is what actually matters.
Width
Width is the decision most people get wrong, in both directions. A single monitor and a laptop needs about 47 inches. Two monitors needs 60 inches before it stops feeling cramped. Anything above 70 inches is genuinely spacious and starts to need a room that can take it. Measure the wall before you fall in love with a size.
Depth
Aim for at least 24 inches of depth, and 30 inches if you use a monitor rather than a laptop. Your eyes want to be about an arm's length from the screen. A shallow desk forces the monitor too close and you will feel it in your neck by the afternoon.
Height
Most fixed desks are around 29 to 30 inches high, which suits people roughly 5 foot 8 to 6 foot. If you are shorter or taller than that range, a fixed desk will make you adjust your chair to a height your feet do not agree with. That is the case for a height adjustable desk, and it is a better reason than fashion.
Drawers, or not
Drawers are useful and they cost you legroom. If you already have a credenza or shelving in the room, buy the desk without drawers and keep the knee space. If the desk is the only storage in the room, take the drawers.
Material
Solid wood tops are heavier, more expensive and last the longest. Engineered wood with a good finish is what most desks in this range use, and it holds up fine to daily work. What matters more than the top is the frame. A steel frame that does not wobble when you lean on it is worth more than an expensive surface on a flimsy base.
One last thing
Check the assembly note and the weight before ordering. Large desks arrive flat packed in more than one box, and a 200 pound desk is a two person job to move into position.