If you are shopping for a printer online there are many sources you can and should turn to. Ranking sites, consumer report sites, ink and toner articles, and large scale search engines should all play their part. But if you need a general outline of which type of printer does what and some basic pros and cons, look no further.
1) Laserjet. Perfect for large offices, schools, and libraries laserjet printers actually do work with a laser, painting a charge onto the paper as it pulls through and electrostatically attracting ink onto the pattern. Once the ink has been pulled onto the paper it is heat fixed and ejected from the machine. Laser printers print sheets faster than just about any other type of printer and have a large amount of toner. Also the toner does not bleed or run with contact to water like an inkjet. Color is available but is very expensive, more so than the normal toner packs which also run up a bill. And these printers may be fast when they are warm, but they take a minute or two to get that way making them awful for one person stop and go printing. Oh, and they are huge.
2) Inkjet. These printers spray dots of ink out of tiny ink nozzles or jets, as their name implies. They have very low start up time, the cartages are cheap, and they are often merged with scanner/copiers and produce great color work. Unfortunately their print speed is slow and the cartridges are always seeming to run on empty. Plus the ink does have a tendency to run out over time. For a single party printing throughout the day, however, the inkjet is the way to go.
So know you know some basics about your printing options, the rest is up to you.