Window 10 is nice one. It gives fast and smooth performance, smooth gamine and video experience, all type of software’s are working on it, there were some problems in gaming, not responding errors and all in other windows but no problem in windows 10, it is in budget.
I recommend windows 10. Good wallpapers and simple look. Nice look of start menu, drives, and have awesome wallpapers. And windows 8.1 can upgraded free of cost.