Do you mostly print text? If so, you'll probably be very happy with a black-and-white laser printer. They create the sharpest, loveliest text of any printer type. Color laser printers produce text that's nearly as nice, but laser printers' graphics look mediocre. For the most professional-looking graphics and any photo printing, you'll need an inkjet printer or all-in-one printer. All of those printers are covered in their own reports.
How fast do you need to print? Business-class laser printers have fast processors and robust memory, so they can print 40 to 50 pages per minute or more. Less expensive laser printers usually print about half that fast -- but that will probably be fast enough for a home user or small work group.
Do you plan to make two-sided printouts? The best printers -- even the cheap ones -- usually have duplexers that allow automatic two-sided printing. If your printer doesn't have a duplexer, you'll have to duplex manually -- printing odd pages first, then flipping the stack over and printing even pages.
Do you want to share the printer -- or print wirelessly? The very cheapest laser printers can only connect to one computer at a time, via USB cable. Step-up laser printers (starting at about $130) usually offer both Ethernet (wired) and Wi-Fi (wireless) networking, but not always. Some printers can print directly from your smartphone or tablet too.
What are your system requirements? Current-model printers will be compatible with recent Windows and Mac operating systems. But if you're using Linux, Unix or older equipment, check to make sure the printer you choose will work.