Apple Remote Desktop doesn't manage anything particually well. Its performance and painfully slow redraw leave me convinced that it's just VNC underneath. In adddition the client interface is like something out of System 6 and isn't very Mac OS X-like at all.

Windows Remote Desktop seems to work in a completely different way and is the first MS technology I've used where I've actaully been impressed and thought 'this is way better than what Apple have'. I use to connect to my headless XP test box from my Mac and sometimes forget I'm not using a real monitor connection.