Laser. I need printing and fax functions. Also, it must have a paper tray.
I would also like eternal uptime 😉. I have an HP LaserJet 4L, and it sucks my balls. Automatic feed stopped working about 2 years ago, and just recently, even manual feed has failed. I've had the printer for about... 8 or 9 years now? A long time, but it's quite inconvenient when you need to print somethign.