Which Windows OS had the greatest leap in features?

Another survey for you all: Which Windows operating system do you think had the greatest leap in terms of features or performance? Also, which Windows operating system do you think was the most successful at its time? My opinion is: For the first question, I would say Windows Vista,and for the second question, my answer would be Windows 95. However, these are just my views. You could have a totally different answer, and you will still be correct. So pls let me know in the comments what you think! Thanks!