95 was very bad for me, I had to reinstall it on my PC like every week, because it was just unstable. Vista is also not great, and it's missing from your list.

95 was very bad for me, I had to reinstall it on my PC like every week, because it was just unstable. Vista is also not great, and it's missing from your list. XP was also very, very bad first, and got better over the years with its service packs.