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Is your question referring to laptops?

If Yes:
The difference between Bluetooth technology and WiFi technology is the following:

Bluetooth is a 'shortwire' replacement for the mass of cables we use to connect 'personal' devices so they can share information. When talking about 'personal' devices we are referring to portable PCs, mobile telephones & headsets, PDAs, digital cameras, MP3 players and so on. As Bluetooth develops, we will see more enabled devices, particularly around the home.

WiFi is the 'longwire' (network cable from desk to hub/server) wireless replacement technology. It is designed to allow users to log onto an office/business network without the need to physically attach via a network card (for portables, a LAN adapter may be built into either the PC, or a docking station. Alternatively, a PC Card may be used.) As long as the user has network access rights, they should be able to log on to the network from anywhere within the network area (building or site). It simplifies the network infrastructure as physical cabling is only needed to connect the wireless access point to a hub or server. By removing physical cabling, costs can be saved, and there is less physical structure to fail / troubleshoot. It also increases the flexibility of the workforce in being able to go anywhere within the network but remain connected.

*Universities use this in some of their buildings so students can connect to the Internet using their laptops.

Conclusion:
If you have a choice to choose between Bluetooth or WiFi, select the technology that you think you will use the most or if you will use your device more in a home or work/network environment.
Bluetooth for "personal devices" and WiFi for networks or work environment.

WiFi™ products are expected to coexist with Bluetooth designs. Usually both technologies come together in the device package.

You may also want to ask the sales rep (before you buy) some of these questions and see what they say since they are usually trained in the technology and features of certain products, and/or contact the company you are buying the product from and ask them questions as well.
Hope this helps.