If you don't print frequently, the ink nozzles clog up (and you inevitably use a bunch of ink trying to fix them). For infrequent document printing, a laser printer will Just Print whether it's been sitting unused for an hour or a month. If you occasionally need some photos printed, using one of the myriad services will be better than replacing the inevitably gunked up ink cartridges.
If you print a lot of documents, the laser printer easily outstrips the speed of an inkjet. You'll also run up huge ink fees since the cost per page of ink tends to be higher than toner.
Therefore, the only reason you should get an inkjet printer is if you often need high quality colour prints (photos).