In windows which operatingsystem is better, Either XP or VISTA??

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Hello friends, i have a doubt.I have a pc with INTEL MOTHERBOARD(945GB),INTEL DUALCORE PROCESSOR(1.8 G.H),&160 GB HARD DISK.I usally use my pc 10 hours daily.Some times i use XP some times i use VISTA ,i am allways confusing which operating system i install when formated pc.For my pc which operating system is better either XP or VISTA.If any other operating systems are better than these give those details also.Plese Give a perminent solution for my problem to use my system more efficiently.....