Reasons to have a desktop computer
A powerful desktop PC is generally less expensive than a powerful notebook with typically more overall options and power.  Desktop PCs also has an advantage in that it can be easily expanded if your needs change (you can add more storage, RAM or a better graphics card at a later date).

Desktop computers have more power and more features. Desktop computers are easier and less expensive, to upgrade. Desktop computers are generally less expensive overall and offer a better overall value. Desktop computers have a more comfortable keyboard and a much easier to use the mouse.