Windows Vista Movieclip Improvement?

I have a client who’s about to buy some systems to run a kiosk animation that I’m in the process of building. He wants to know if there’s any advantage to getting Windows Vista to run it on. I myself don’t have Vista and have no real clue if there’s an advantage to running a Flash movie clip with DirectX 10. I’ve seen a post saying that there’s a lag when you first start a full screen movie clip (something to do with the Aero interface) but after that I don’t know if there’s any problem. Can anyone point me towards some articles on this or something?