Laser printers have a different process of transferring images onto the paper than an inkjet printer. I think inkjet and deskjet are the same.
Laser printers produce much better quality black text documents than inkjets, and they tend to be designed more for the long haul because they turn out more pages per month at a lower cost per page than inkjets. So, if it's an office workhorse that's required, the laser printer may be the best option.
There are also color laser printers but they are sooooooooo big and soooooooo expensive.
Deskjets or inkjets are so affordable today and the quality are outstanding that for consumer level, it's a best buy and by far, most common.