Windows 7 ultimate is the best for OSs. The best part of windows 7 is the lightweight build of it and how fast it moves
I used all windows Microsoft released. Among them I like windows 7 the most. its really awesome. everyone should try this.
Got Windows VISTA 64 on Sony notebook with 6 GB RAM but performance is dead slow. So, Windows 7 will be a better choice.
There's no reason of asking this - everyone will tell you Win7 is the supreme OS - it's comparatively extremely stable and what's more - offers highly intuitive interface and bugs are past. Here is another interesting fact - Windows 7 (initially developed under the name Blackcomb) is actually a predecessor of Vista: http.//en.wikipedia.org/wiki/Windows_7 (live links not available yet, sorry)
Between the two, it's Win7 hands down. Visturd sucks. My primary OS, however, is and always will be Archlinux x86_64 running the custom Zen Kernel, and a lot of tweaks. I even use BTRFS, which is rock solid despite being a beta.