font client

Deciding between client and server based font management

My company wants to sort out font management issues and, after looking at different options, we're considering buying software from either Extensis or Linotype.
But the bigger question than which software maker to go with, however, is should we buy several client licenses or a server license? We couldn't fully understand the exact way font server works, so any explanations (as you'd talk to a child) are welcome.

    Could you recommend the right choice based on the below?
  1. Currently, 6 computers would need constant access to the font library (5 Macs and 1 PC). This number may increase in the future but not drastically.