I use both, my laptop has not enough RAM to run vista so i use XP, vista is the best i think, i have it on a PC, it works so much faster than it did with XP, i like the look of Vista much more than XP, Vista stops other people in my family messing up the computer because of the security, i like a lot of the new features, such as that side bar where you can see your CPU temperature and usage which is cool to look at, there's much more but im not going to list them all here, highly recommend it though!
