The first thing you will have to decide is do you want a laptop or a desktop computer? If you want to be comfortable in your work space and have a dedicated work space already you may want a desktop. Sure they take up more room than a laptop and they’re not at all portable but they usually give you more performance for the money and they are cheaper to repair should anything go awry. You will get a larger screen with a desktop, better speakers and an all around better product should you want to sit in the same place day in and day out to do your computing.
A laptop of course is more practical for when you need to take your computer with you. It can be set up anywhere and all you have to do is periodically recharge it. On the downside, you may find yourself computing on the floor or the couch which may give you a back or neck strain. Laptops usually have smaller screens and less performance for the same price as a desktop.