The main benefit of using NetBEUI for File and Printer sharing is the fact that it is a non-routable protocol.

In other words, NetBEUI based computers (or PDAs, APs, etc.) that are NOT located on the same LAN segment/subnet can not be accessed (across disjoint LAN segments) for their shared resources.

Therefore, you should seriously consider using NetBEUI (in stead of TCP/IP) for sharing your LAN based resources -especially if:

• Your LAN is Directly Linked to the Internet: There are times when every computer on a LAN needs to be connected to the Internet using publicly routable IP addresses. In other words, those computers will now be seen/reached directly from the outside -the Internet. Considering Internet connectivity is based on TCP/IP, if you happen to enable TCP/IP based sharing of any resources on your computers (File & Printer sharing, etc.), you could potentially be sharing those resources with the entire Internet. Using strong passwords in a situation like that may stall the intruders for a while, but if an intruder is motivated enough, your content (shared using TCP/IP) will eventually be compromised.
  
• Need to Share between LAN and Internet on Different Network Segments/Subnets: Most network engineers would isolate (by using firewalls, proxy, setting up a DMZ, etc.) your LAN from the Internet by placing it on a disjoint network segment/subnet. There are times, however, when one needs to share resources between the two, and one has to (grudgingly) open up a port or two (such as TCP or UDP ports 137, 138, and 139, etc.) to make certain critical applications work. This becomes an issue especially when you do not have a real router on your network. By doing so, you are actually exposing those LAN based resources to the Internet.

In situations such as the ones outlined above, it would be highly advisable to disable (unbind) TCP/IP and use (bind) NetBEUI in stead for your entire File and Printer sharing needs.