The Vista Help & Discussion board was merged with the Windows & General Software board when we had the reshuffle, Tony, as it was felt that once Vista has been established, a separate board wasn't really merited.
I wouldn't like to say which is best, but certainly on an older machine, or one with lowish resources, Vista would run like it was wading through treacle. There are also still some software and driver compatibility issues with Vista, but that's because some of the software companies haven't caught up yet. Personally, I like XP, because it's tried and trusted, but I do know quite a few people who prefer Vista.