I have a Motorola Razr V3. When it comes to transferring ringtones and pictures either way between my computer (with Windows Home XP SP2) and Tthe phone, which is the fastest and most efficient method? What are the advantages and disadvantages of each?
The cable is faster, unquestionably. It's also more reliable.
Bluetooth is good when you can't or don't want to have the phone and computer immediately together. This can be useful for data tethering, if your laptop interferes with your cell signal or if you want to put the phone a few feet away where it gets better signal.
The USB cable will charge the phone but only while it is on. This is a nice bonus. Bluetooth of course drains the phone faster because it is transmitting and receiving data to both the cell site and to the computer.
Both are good and I use both, but if I were to only use one I'd use a USB cable.
With a data cable, you need software to transfer files back and forth (MPT, among many others,) but with Bluetooth, you can just use Windows. I prefer Bluetooth because I don't like having a bunch of software on my computer that rarely use.