It really depends on what you use your computer for. If all you do is browse the web and do email and maybe some word processing, then Vista is probably just fine.
If for example you want to do video or audio editing/recording or possibly gaming, then XP is a better performance and configuration choice. It's documented and benchmarked fact.
Theoretically Vista might be better for networked office computers since it has heightened security. But I don't know for sure. I'd ask a network administrator about that one.
I have an old XP computer and a new Vista computer. The XP computer was configured and running smoothly in a few weeks. The Vista computer was configured and running OK but with some complaints after months of tweaking and research. Both operating systems are new to me since I previously used Windows 98 SE up to recent times. I use both of my computers for audio editing and recording.
I too saw that study done with Mojave, but personally I think it's used just to promote Vista by Microsoft and avoid discussion of Vista's actual flaws.
Edited by BlackBurst, 01 September 2008 - 12:31 PM.