A typical office could probably get by with a standard multifunctional machine with a decent paper per minute count. The busier offices may need something a little more intense. But anyplace that relies heavily on production and digital printing is going to need a heavy-duty xerox machine. It is going to need the copy machine to end all machines.
Presses, wide format printers, and continuous feed xerox machines are the absolute best options if you expect to be doing a lot of poster and booklet printing. These are must haves because they can not only handle the amount of copies, they do it efficiently and in extreme high quality. You will get rich colors on all the documents, just as vivid as the originals you copied.
Unlike the smaller tabletops or small office machines, these take up more space. But in return they can do a whole lot more. That means that you can feed specialty papers, such as those with texture: gloss, coated, recycled, or card stock. Some can even handle perforations, tabs, labels, and other atypical paper types. And if you need anything bound or stapled, you can find that too!
If you do a lot of professional printing then these are the right machines for you.