Depends on the budget. You can get little desktop drawing "tablets" cheap, they're small but work decently. They don't have screens. The best for any art on a computer would probably be something from Wacom, which are somewhat to extremely expensive. They're easier to work on because you draw on the screen itself, allowing you to see exactly where your physical pen will mark the digital workspace, and where to move it to achieve whatever stroke you are making. Other tablet manufacturers are out there that make tablets like this, but Wacom is one of the best brands.