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I have been doing tech support using remote control software (RCS) of many varieties for many, many years. If you remember Carbon Copy, you’ve been around the block, too!
Remote desktop (RD) is one of the higher performing alternatives out there, followed closely by GoToMyPC, LogMeIn, and RealVNC in a pack. PCAnywhere runs a bit more sluggishly. Packet tracing also shows that it is a bit more “chatty” than some other alternatives.
One of the main differences I find in RCS has to do with the mechanics of transferring files. Often, while doing system monitoring and maintenance I need to send or receive files. I find that RD has a natural feel, PCAnywhere is pretty good, and RealVNCs Cut/Paste more cumbersome.
Security concerns mostly dictate against GoToMyPC & LogMeIn though they have their place.
Currently, for my clients I am mainly using PCAnywhere for most Windows clients, and RealVNC for Windows 2008 servers. If a client has chosen GoToMyPC or LogMeIn, I’ll use it to reduce the access avenues.

Cheers,
Jeff