Differences between Win 7,8 and 10 ?Worth it to upgrade to lastest Office suite?

[Windows Central Question]

I have 1 2 part question.
1.Differences between Win 7,8 and 10 ? What does each offer thats new / different / positive ?

2.Worth it to upgrade to lastest Office suite? Any new features or advantages in it ?

 

[Rad Brothers]

Hi, i updated my PC and tablet on Win10. Before that I used Win7. Win 10 i like for interface and stability.