When you are buying a printer, one of the first questions you are asked is wired, wireless, or USB. I don't even think you can buy SCSI, firewire, parallel or serial printers except for specialty business printers. Here's how you know what type of printer interface you need:
USB: For a home single user. Desktop users not sharing out their printers. It's a direct connection so this is fast but not as fast as an ethernet printer. We are talking hi-speed 2.0 USB with a data transfer rate of 480 mbps. If the device doesn't say "HIGH speed USB" then assume it is 12 mbps.
Wired:For multiple computer users need to connect to a printer. Also when you need faster data transfer rates! This speed varies, but can be up to 1000 mbps for gigabit ethernet. Fast ethernet is about 100 mbps.
Wireless: Small house (short distance for the wireless signal to travel) and multiple users want to connect. Also choose this if you don't have a network drop for the location where you want to place the printer. Wireless data transfer rate depends on the wireless card you have and the wireless router you have. Usually it's slower, but more convenient than wired printing.
Hope this helps!
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